Use Mox by default for local integration tests

How to run without Mox is in the root `README.md`.

Run all combinations of Variant and Transport on CircleCI to ensure that
Mox matches HTTP behavior, so Mox can be used for fast local testing:
* Geth, HTTP
* Geth, Mox
* Parity, HTTP
* Parity, Mox

Using Mox locally also lessens load on Sokol and the Infura API key the
tests use for Geth under the assumption that we do far more local
testing than CI testing.  May help with #340, but does not fix the root
cause, which is now known as `Sequence` not chunking ranges correctly on
retry.

.circleci/config.yml

@@ -296,7 +296,7 @@ jobs:
           name: Scan explorer_web for vulnerabilities
           command: mix sobelow --config
           working_directory: "apps/explorer_web"
-  test_geth:
+  test_geth_http:
     docker:
       # Ensure .tool-versions matches
       - image: circleci/elixir:1.6.5-node-browsers
@@ -306,7 +306,10 @@ jobs:
           PGPASSWORD: postgres
           # match POSTGRES_USER for postgres image below
           PGUSER: postgres
-          ETHEREUM_JSONRPC_VARIANT: geth
+          ETHEREUM_JSONRPC_VARIANT: "EthereumJSONRPC.Geth"
+          ETHEREUM_JSONRPC_TRANSPORT: "EthereumJSONRPC.HTTP"
+          ETHEREUM_JSONRPC_HTTP: "EthereumJSONRPC.HTTP.HTTPoison"
+          ETHEREUM_JSONRPC_HTTP_URL: "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"
       - image: circleci/postgres:10.3-alpine
         environment:
           # Match apps/explorer/config/test.exs config :explorerer, Explorer.Repo, database
@@ -333,7 +336,7 @@ jobs:
 
       - store_test_results:
           path: _build/test/junit
-  test_parity:
+  test_geth_mox:
     docker:
       # Ensure .tool-versions matches
       - image: circleci/elixir:1.6.5-node-browsers
@@ -343,7 +346,8 @@ jobs:
           PGPASSWORD: postgres
           # match POSTGRES_USER for postgres image below
           PGUSER: postgres
-          ETHEREUM_JSONRPC_VARIANT: parity
+          ETHEREUM_JSONRPC_VARIANT: "EthereumJSONRPC.Geth"
+          ETHEREUM_JSONRPC_TRANSPORT: "EthereumJSONRPC.Mox"
       - image: circleci/postgres:10.3-alpine
         environment:
           # Match apps/explorer/config/test.exs config :explorerer, Explorer.Repo, database
@@ -366,7 +370,86 @@ jobs:
           name: Wait for DB
           command: dockerize -wait tcp://localhost:5432 -timeout 1m
 
-      - run: mix coveralls.circle --parallel --umbrella
+      - run: mix coveralls.circle --exclude no_geth --parallel --umbrella
+
+      - store_test_results:
+          path: _build/test/junit
+  test_parity_http:
+    docker:
+      # Ensure .tool-versions matches
+      - image: circleci/elixir:1.6.5-node-browsers
+        environment:
+          MIX_ENV: test
+          # match POSTGRES_PASSWORD for postgres image below
+          PGPASSWORD: postgres
+          # match POSTGRES_USER for postgres image below
+          PGUSER: postgres
+          ETHEREUM_JSONRPC_VARIANT: "EthereumJSONRPC.Parity"
+          # enable on-chain tests against Sokol instead of `mox` tests run locally
+          ETHEREUM_JSONRPC_TRANSPORT: "EthereumJSONRPC.HTTP"
+          ETHEREUM_JSONRPC_HTTP: "EthereumJSONRPC.HTTP.HTTPoison"
+          ETHEREUM_JSONRPC_HTTP_URL: "https://sokol-trace.poa.network"
+      - image: circleci/postgres:10.3-alpine
+        environment:
+          # Match apps/explorer/config/test.exs config :explorer, Explorer.Repo, database
+          POSTGRES_DB: explorer_test
+          # match PGPASSWORD for elixir image above
+          POSTGRES_PASSWORD: postgres
+          # match PGUSER for elixir image above
+          POSTGRES_USER: postgres
+
+    working_directory: ~/app
+
+    steps:
+      - attach_workspace:
+          at: .
+
+      - run: mix local.hex --force
+      - run: mix local.rebar --force
+
+      - run:
+          name: Wait for DB
+          command: dockerize -wait tcp://localhost:5432 -timeout 1m
+
+      - run: mix coveralls.circle --exclude no_parity --parallel --umbrella
+
+      - store_test_results:
+          path: _build/test/junit
+  test_parity_mox:
+    docker:
+      # Ensure .tool-versions matches
+      - image: circleci/elixir:1.6.5-node-browsers
+        environment:
+          MIX_ENV: test
+          # match POSTGRES_PASSWORD for postgres image below
+          PGPASSWORD: postgres
+          # match POSTGRES_USER for postgres image below
+          PGUSER: postgres
+          ETHEREUM_JSONRPC_VARIANT: "EthereumJSONRPC.Parity"
+          ETHEREUM_JSONRPC_TRANSPORT: "EthereumJSONRPC.Mox"
+      - image: circleci/postgres:10.3-alpine
+        environment:
+          # Match apps/explorer/config/test.exs config :explorer, Explorer.Repo, database
+          POSTGRES_DB: explorer_test
+          # match PGPASSWORD for elixir image above
+          POSTGRES_PASSWORD: postgres
+          # match PGUSER for elixir image above
+          POSTGRES_USER: postgres
+
+    working_directory: ~/app
+
+    steps:
+      - attach_workspace:
+          at: .
+
+      - run: mix local.hex --force
+      - run: mix local.rebar --force
+
+      - run:
+          name: Wait for DB
+          command: dockerize -wait tcp://localhost:5432 -timeout 1m
+
+      - run: mix coveralls.circle --exclude no_parity --parallel --umbrella
 
       - store_test_results:
           path: _build/test/junit
@@ -394,8 +477,10 @@ workflows:
             - eslint
             - jest
             - sobelow
-            - test_parity
-            - test_geth
+            - test_parity_http
+            - test_parity_mox
+            - test_geth_http
+            - test_geth_mox
       - dialyzer:
           requires:
             - build
@@ -411,9 +496,15 @@ workflows:
       - sobelow:
           requires:
             - build
-      - test_parity:
+      - test_parity_http:
+          requires:
+            - build
+      - test_parity_mox:
+          requires:
+            - build
+      - test_geth_http:
           requires:
             - build
-      - test_geth:
+      - test_geth_mox:
           requires:
             - build

apps/ethereum_jsonrpc/README.md

@@ -20,6 +20,17 @@ via `:trace_url`. The trace URL and is used for
 tracing nodes. The `:http` option is passed directly to the HTTP
 library (`HTTPoison`), which forwards the options down to `:hackney`.
 
+## Testing
+
+By default, [`mox`](https://github.com/plataformatec/mox) will be used to mock the `EthereumJSONRPC.Transport` and `EthereumJSONRPC.HTTP` behaviours.  They mocked behaviours returns differ based on the `EthereumJSONRPC.Variant`.
+
+| `EthereumJSONRPC.Variant` | `EthereumJSONRPC.Transport` | `EthereumJSONRPC.HTTP`           | `url`                                             | Command                                                                                                                                                                                                                                                  | Usage(s)                                           |
+|:--------------------------|:----------------------------|:---------------------------------|:--------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------|
+| `EthereumJSONRPC.Parity`  | `EthereumJSONRPC.Mox`       | `EthereumJSONRPC.HTTP.Mox`       | N/A                                               | `mix test`                                                                                                                                                                                                                                               | Local, `circleci/config.yml` `test_parity_mox` job |
+| `EthereumJSONRPC.Parity`  | `EthereumJSONRPC.HTTP`      | `EthereumJSONRPC.HTTP.HTTPoison` | `https://trace-sokol.poa.network`                 | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Parity ETHEREUM_JSONRPC_TRANSPORT=EthereumJSONRPC.HTTP ETHEREUM_JSONRPC_HTTP=EthereumJSONRPC.HTTP.HTTPoison ETHEREUM_JSONRPC_HTTP_URL=https://sokol-trace.poa.network mix test --exclude no_parity`            | `.circleci/config.yml` `test_parity_http` job      |
+| `EthereumJSONRPC.Geth`    | `EthereumJSONRPC.Mox`       | `EthereumJSONRPC.HTTP.Mox`       | N/A                                               | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Geth mix test --exclude no_geth`                                                                                                                                                                               | `.circleci/config.yml` `test_geth_http` job        |
+| `EthereumJSONRPC.Geth`    | `EthereumJSONRPC.HTTP`      | `EthereumJSONRPC.HTTP.HTTPoison` | `https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY`  | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Geth ETHEREUM_JSONRPC_TRANSPORT=EthereumJSONRPC.HTTP ETHEREUM_JSONRPC_HTTP=EthereumJSONRPC.HTTP.HTTPoison ETHEREUM_JSONRPC_HTTP_URL=https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY mix test --exclude no_geth` | `.circleci/config.yml` `test_geth_http` job        |
+
 ## Installation
 
 The OTP application `:ethereum_jsonrpc` can be used in other umbrella

apps/ethereum_jsonrpc/mix.exs

@@ -69,6 +69,8 @@ defmodule EthereumJsonrpc.MixProject do
       {:httpoison, "~> 1.0", override: true},
       # Decode/Encode JSON for JSONRPC
       {:jason, "~> 1.0"},
+      # Mocking `EthereumJSONRPC.Transport` and `EthereumJSONRPC.HTTP` so we avoid hitting real chains for local testing
+      {:mox, "~> 0.3.2", only: [:test]},
       # Convert unix timestamps in JSONRPC to DateTimes
       {:timex, "~> 3.1.24"}
     ]

apps/ethereum_jsonrpc/test/etheream_jsonrpc_test.exs

@@ -1,99 +1,130 @@
 defmodule EthereumJSONRPCTest do
-  use ExUnit.Case, async: true
+  use EthereumJSONRPC.Case, async: true
 
   import EthereumJSONRPC.Case
+  import Mox
 
-  @moduletag :capture_log
-
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
-
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  setup :verify_on_exit!
 
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
-      end
-
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
-  end
+  @moduletag :capture_log
 
   describe "fetch_balances/1" do
     test "with all valid hash_data returns {:ok, addresses_params}", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
-      assert {:ok,
-              [
-                %{
-                  fetched_balance: fetched_balance,
-                  fetched_balance_block_number: 1,
-                  hash: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b"
-                }
-              ]} =
-               EthereumJSONRPC.fetch_balances(
-                 [
-                   %{block_quantity: "0x1", hash_data: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b"}
-                 ],
-                 json_rpc_named_arguments
-               )
-
-      case Keyword.fetch!(json_rpc_named_arguments, :variant) do
-        EthereumJSONRPC.Geth ->
-          assert fetched_balance == 0
-
-        EthereumJSONRPC.Parity ->
-          assert fetched_balance == 1
+      expected_fetched_balance =
+        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+          EthereumJSONRPC.Geth -> 0
+          EthereumJSONRPC.Parity -> 1
+          variant -> raise ArgumentError, "Unsupported variant (#{variant}})"
+        end
 
-        variant ->
-          raise ArgumentError, "Unsupported variant (#{variant}})"
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, [%{id: 0, result: EthereumJSONRPC.integer_to_quantity(expected_fetched_balance)}]}
+        end)
       end
+
+      hash = "0x8bf38d4764929064f2d4d3a56520a76ab3df415b"
+
+      assert EthereumJSONRPC.fetch_balances(
+               [
+                 %{block_quantity: "0x1", hash_data: hash}
+               ],
+               json_rpc_named_arguments
+             ) ==
+               {:ok,
+                [
+                  %{
+                    fetched_balance: expected_fetched_balance,
+                    fetched_balance_block_number: 1,
+                    hash: hash
+                  }
+                ]}
     end
 
     test "with all invalid hash_data returns {:error, reasons}", %{json_rpc_named_arguments: json_rpc_named_arguments} do
-      assert {:error, reasons} =
-               EthereumJSONRPC.fetch_balances([%{block_quantity: "0x1", hash_data: "0x0"}], json_rpc_named_arguments)
-
-      assert is_list(reasons)
-      assert length(reasons) == 1
+      variant = Keyword.fetch!(json_rpc_named_arguments, :variant)
 
-      [reason] = reasons
+      expected_message =
+        case variant do
+          EthereumJSONRPC.Geth ->
+            "invalid argument 0: json: cannot unmarshal hex string of odd length into Go value of type common.Address"
 
-      assert %{
-               code: -32602,
-               data: %{"blockNumber" => "0x1", "hash" => "0x0"},
-               message: message
-             } = reason
+          EthereumJSONRPC.Parity ->
+            "Invalid params: invalid length 1, expected a 0x-prefixed, padded, hex-encoded hash with length 40."
 
-      case Keyword.fetch!(json_rpc_named_arguments, :variant) do
-        EthereumJSONRPC.Geth ->
-          assert message ==
-                   "invalid argument 0: json: cannot unmarshal hex string of odd length into Go value of type common.Address"
-
-        EthereumJSONRPC.Parity ->
-          assert message ==
-                   "Invalid params: invalid length 1, expected a 0x-prefixed, padded, hex-encoded hash with length 40."
+          _ ->
+            raise ArgumentError, "Unsupported variant (#{variant}})"
+        end
 
-        variant ->
-          raise ArgumentError, "Unsupported variant (#{variant}})"
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               id: 0,
+               error: %{
+                 code: -32602,
+                 message: expected_message
+               }
+             }
+           ]}
+        end)
       end
+
+      assert {:error,
+              [
+                %{
+                  code: -32602,
+                  data: %{"blockNumber" => "0x1", "hash" => "0x0"},
+                  message: ^expected_message
+                }
+              ]} =
+               EthereumJSONRPC.fetch_balances([%{block_quantity: "0x1", hash_data: "0x0"}], json_rpc_named_arguments)
     end
 
     test "with a mix of valid and invalid hash_data returns {:error, reasons}", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {
+            :ok,
+            [
+              %{
+                id: 0,
+                result: "0x0"
+              },
+              %{
+                id: 1,
+                result: "0x1"
+              },
+              %{
+                id: 2,
+                error: %{
+                  code: -32602,
+                  message:
+                    "Invalid params: invalid length 1, expected a 0x-prefixed, padded, hex-encoded hash with length 40."
+                }
+              },
+              %{
+                id: 3,
+                result: "0x3"
+              },
+              %{
+                id: 4,
+                error: %{
+                  code: -32602,
+                  message:
+                    "Invalid params: invalid length 1, expected a 0x-prefixed, padded, hex-encoded hash with length 40."
+                }
+              }
+            ]
+          }
+        end)
+      end
+
       assert {:error, reasons} =
                EthereumJSONRPC.fetch_balances(
                  [
@@ -134,6 +165,12 @@ defmodule EthereumJSONRPCTest do
   describe "fetch_block_number_by_tag" do
     @tag capture_log: false
     test "with earliest", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, %{"number" => "0x0"}}
+        end)
+      end
+
       log_bad_gateway(
         fn -> EthereumJSONRPC.fetch_block_number_by_tag("earliest", json_rpc_named_arguments) end,
         fn result ->
@@ -144,6 +181,12 @@ defmodule EthereumJSONRPCTest do
 
     @tag capture_log: false
     test "with latest", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, %{"number" => "0x1"}}
+        end)
+      end
+
       log_bad_gateway(
         fn -> EthereumJSONRPC.fetch_block_number_by_tag("latest", json_rpc_named_arguments) end,
         fn result ->
@@ -155,6 +198,12 @@ defmodule EthereumJSONRPCTest do
 
     @tag capture_log: false
     test "with pending", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, %{"number" => "0x2"}}
+        end)
+      end
+
       log_bad_gateway(
         fn -> EthereumJSONRPC.fetch_block_number_by_tag("pending", json_rpc_named_arguments) end,
         fn result ->

apps/ethereum_jsonrpc/test/ethereum_jsonrpc/geth_test.exs

@@ -1,36 +1,10 @@
 defmodule EthereumJSONRPC.GethTest do
-  use ExUnit.Case, async: false
+  use EthereumJSONRPC.Case, async: false
 
   alias EthereumJSONRPC.Geth
 
   @moduletag :no_parity
 
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
-
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
-
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
-      end
-
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ]
-      ],
-      variant: variant
-    }
-  end
-
   describe "fetch_internal_transactions/2" do
     test "is not supported", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       Geth.fetch_internal_transactions(

apps/ethereum_jsonrpc/test/ethereum_jsonrpc/http/mox_test.exs

@@ -0,0 +1,121 @@
+defmodule EthereumJSONRPC.HTTP.MoxTest do
+  @moduledoc """
+  Tests differences in behavior of `EthereumJSONRPC` when `EthereumJSONRPC.HTTP` is used as the transport that are too
+  detrimental to run against Sokol, so uses `EthereumJSONRPC.HTTP.Mox` instead.
+  """
+
+  use ExUnit.Case, async: true
+
+  import EthereumJSONRPC, only: [request: 1]
+  import EthereumJSONRPC.HTTP.Case
+  import Mox
+
+  setup do
+    %{
+      json_rpc_named_arguments: [
+        transport: EthereumJSONRPC.HTTP,
+        transport_options: [
+          http: EthereumJSONRPC.HTTP.Mox,
+          url: url(),
+          http_options: http_options()
+        ]
+      ]
+    }
+  end
+
+  setup :verify_on_exit!
+
+  describe "json_rpc/2" do
+    # regression test for https://github.com/poanetwork/poa-explorer/issues/254
+    #
+    # this test triggered a DoS with CloudFlare reporting 502 Bad Gateway
+    # (see https://github.com/poanetwork/poa-explorer/issues/340), so it can't be run against the real Sokol chain and
+    # must use `mox` to fake it.
+    test "transparently splits batch payloads that would trigger a 413 Request Entity Too Large", %{
+      json_rpc_named_arguments: json_rpc_named_arguments
+    } do
+      if json_rpc_named_arguments[:transport_options][:http] == EthereumJSONRPC.HTTP.Mox do
+        EthereumJSONRPC.HTTP.Mox
+        |> expect(:json_rpc, 2, fn _url, json, _options ->
+          assert IO.iodata_to_binary(json) =~ ":13000"
+
+          {:ok, %{body: "413 Request Entity Too Large", status_code: 413}}
+        end)
+        |> expect(:json_rpc, fn _url, json, _options ->
+          json_binary = IO.iodata_to_binary(json)
+
+          refute json_binary =~ ":13000"
+          assert json_binary =~ ":6499"
+
+          body =
+            0..6499
+            |> Enum.map(fn id ->
+              %{jsonrpc: "2.0", id: id, result: %{number: EthereumJSONRPC.integer_to_quantity(id)}}
+            end)
+            |> Jason.encode!()
+
+          {:ok, %{body: body, status_code: 200}}
+        end)
+        |> expect(:json_rpc, fn _url, json, _optons ->
+          json_binary = IO.iodata_to_binary(json)
+
+          refute json_binary =~ ":6499"
+          assert json_binary =~ ":6500"
+          assert json_binary =~ ":13000"
+
+          body =
+            6500..13000
+            |> Enum.map(fn id ->
+              %{jsonrpc: "2.0", id: id, result: %{number: EthereumJSONRPC.integer_to_quantity(id)}}
+            end)
+            |> Jason.encode!()
+
+          {:ok, %{body: body, status_code: 200}}
+        end)
+      end
+
+      block_numbers = 0..13000
+
+      payload =
+        block_numbers
+        |> Stream.with_index()
+        |> Enum.map(&get_block_by_number_request/1)
+
+      assert_payload_too_large(payload, json_rpc_named_arguments)
+
+      assert {:ok, responses} = EthereumJSONRPC.json_rpc(payload, json_rpc_named_arguments)
+      assert Enum.count(responses) == Enum.count(block_numbers)
+
+      block_number_set = MapSet.new(block_numbers)
+
+      response_block_number_set =
+        Enum.into(responses, MapSet.new(), fn %{result: %{"number" => quantity}} ->
+          EthereumJSONRPC.quantity_to_integer(quantity)
+        end)
+
+      assert MapSet.equal?(response_block_number_set, block_number_set)
+    end
+  end
+
+  defp assert_payload_too_large(payload, json_rpc_named_arguments) do
+    assert Keyword.fetch!(json_rpc_named_arguments, :transport) == EthereumJSONRPC.HTTP
+
+    transport_options = Keyword.fetch!(json_rpc_named_arguments, :transport_options)
+
+    http = Keyword.fetch!(transport_options, :http)
+    url = Keyword.fetch!(transport_options, :url)
+    json = Jason.encode_to_iodata!(payload)
+    http_options = Keyword.fetch!(transport_options, :http_options)
+
+    assert {:ok, %{body: body, status_code: 413}} = http.json_rpc(url, json, http_options)
+    assert body =~ "413 Request Entity Too Large"
+  end
+
+  defp get_block_by_number_request({block_number, id}) do
+    request(%{
+      id: id,
+      method: "eth_getBlockByNumber",
+      params: [EthereumJSONRPC.integer_to_quantity(block_number), true]
+    })
+  end
+end

apps/ethereum_jsonrpc/test/ethereum_jsonrpc/parity_test.exs

@@ -1,32 +1,77 @@
 defmodule EthereumJSONRPC.ParityTest do
   use ExUnit.Case, async: true
+  use EthereumJSONRPC.Case
 
-  @moduletag :no_geth
+  import EthereumJSONRPC, only: [integer_to_quantity: 1]
+  import Mox
 
-  setup do
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: "https://sokol-trace.poa.network",
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ]
-      ]
-    }
-  end
+  setup :verify_on_exit!
 
   doctest EthereumJSONRPC.Parity
 
+  @moduletag :no_geth
+
   describe "fetch_internal_transactions/1" do
     test "with all valid transaction_params returns {:ok, transactions_params}", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      from_address_hash = "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca"
+      gas = 4_533_872
+
+      init =
+        "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"
+
+      value = 0
+      block_number = 1
+      index = 0
+      created_contract_address_hash = "0x1e0eaa06d02f965be2dfe0bc9ff52b2d82133461"
+
+      created_contract_code =
+        "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"
+
+      gas_used = 382_953
+      trace_address = []
+      transaction_hash = "0x0fa6f723216dba694337f9bb37d8870725655bdf2573526a39454685659e39b1"
+      type = "create"
+
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               id: 0,
+               result: %{
+                 "trace" => [
+                   %{
+                     "action" => %{
+                       "from" => from_address_hash,
+                       "gas" => integer_to_quantity(gas),
+                       "init" => init,
+                       "value" => integer_to_quantity(value)
+                     },
+                     "blockNumber" => block_number,
+                     "index" => index,
+                     "result" => %{
+                       "address" => created_contract_address_hash,
+                       "code" => created_contract_code,
+                       "gasUsed" => integer_to_quantity(gas_used)
+                     },
+                     "traceAddress" => trace_address,
+                     "transactionHash" => transaction_hash,
+                     "type" => type
+                   }
+                 ]
+               }
+             }
+           ]}
+        end)
+      end
+
       assert EthereumJSONRPC.Parity.fetch_internal_transactions(
                [
                  %{
-                   block_number: 1,
-                   hash_data: "0x0fa6f723216dba694337f9bb37d8870725655bdf2573526a39454685659e39b1"
+                   block_number: block_number,
+                   hash_data: transaction_hash
                  }
                ],
                json_rpc_named_arguments
@@ -35,19 +80,17 @@ defmodule EthereumJSONRPC.ParityTest do
                [
                  %{
                    block_number: 1,
-                   created_contract_address_hash: "0x1e0eaa06d02f965be2dfe0bc9ff52b2d82133461",
-                   created_contract_code:
-                     "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",
-                   from_address_hash: "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
-                   gas: 4_533_872,
-                   gas_used: 382_953,
-                   index: 0,
-                   init:
-                     "0x6060604052341561000f57600080fd5b60405160208061071a83398101604052808051906020019091905050806000806101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff1602179055506003600160006001600281111561007e57fe5b60ff1660ff168152602001908152602001600020819055506002600160006002808111156100a857fe5b60ff1660ff168152602001908152602001600020819055505061064a806100d06000396000f30060606040526004361061008e576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063247b3210146100935780632ffdfc8a146100bc57806374294144146100f6578063ae4b1b5b14610125578063bf7370d11461017a578063d1104cb2146101a3578063eecd1079146101f8578063fcff021c14610221575b600080fd5b341561009e57600080fd5b6100a661024a565b6040518082815260200191505060405180910390f35b34156100c757600080fd5b6100e0600480803560ff16906020019091905050610253565b6040518082815260200191505060405180910390f35b341561010157600080fd5b610123600480803590602001909190803560ff16906020019091905050610276565b005b341561013057600080fd5b61013861037a565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b341561018557600080fd5b61018d61039f565b6040518082815260200191505060405180910390f35b34156101ae57600080fd5b6101b66104d9565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b341561020357600080fd5b61020b610588565b6040518082815260200191505060405180910390f35b341561022c57600080fd5b6102346105bd565b6040518082815260200191505060405180910390f35b600060c8905090565b6000600160008360ff1660ff168152602001908152602001600020549050919050565b61027e6104d9565b73ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff161415156102b757600080fd5b60008160ff161115156102c957600080fd5b6002808111156102d557fe5b60ff168160ff16111515156102e957600080fd5b6000821180156103125750600160008260ff1660ff168152602001908152602001600020548214155b151561031d57600080fd5b81600160008360ff1660ff168152602001908152602001600020819055508060ff167fe868bbbdd6cd2efcd9ba6e0129d43c349b0645524aba13f8a43bfc7c5ffb0889836040518082815260200191505060405180910390a25050565b6000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1681565b6000806000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16638b8414c46000604051602001526040518163ffffffff167c0100000000000000000000000000000000000000000000000000000000028152600401602060405180830381600087803b151561042f57600080fd5b6102c65a03f1151561044057600080fd5b5050506040518051905090508073ffffffffffffffffffffffffffffffffffffffff16630eaba26a6000604051602001526040518163ffffffff167c0100000000000000000000000000000000000000000000000000000000028152600401602060405180830381600087803b15156104b857600080fd5b6102c65a03f115156104c957600080fd5b5050506040518051905091505090565b60008060009054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1663a3b3fff16000604051602001526040518163ffffffff167c0100000000000000000000000000000000000000000000000000000000028152600401602060405180830381600087803b151561056857600080fd5b6102c65a03f1151561057957600080fd5b50505060405180519050905090565b60006105b860016105aa600261059c61039f565b6105e590919063ffffffff16565b61060090919063ffffffff16565b905090565b60006105e06105ca61039f565b6105d261024a565b6105e590919063ffffffff16565b905090565b60008082848115156105f357fe5b0490508091505092915050565b600080828401905083811015151561061457fe5b80915050929150505600a165627a7a723058206b7eef2a57eb659d5e77e45ab5bc074e99c6a841921038cdb931e119c6aac46c0029000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
-                   trace_address: [],
-                   transaction_hash: "0x0fa6f723216dba694337f9bb37d8870725655bdf2573526a39454685659e39b1",
-                   type: "create",
-                   value: 0
+                   created_contract_address_hash: created_contract_address_hash,
+                   created_contract_code: created_contract_code,
+                   from_address_hash: from_address_hash,
+                   gas: gas,
+                   gas_used: gas_used,
+                   index: index,
+                   init: init,
+                   trace_address: trace_address,
+                   transaction_hash: transaction_hash,
+                   type: type,
+                   value: value
                  }
                ]
              }
@@ -56,6 +99,21 @@ defmodule EthereumJSONRPC.ParityTest do
     test "with all invalid transaction_params returns {:error, reasons}", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               id: 0,
+               error: %{
+                 code: -32603,
+                 message: "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
+               }
+             }
+           ]}
+        end)
+      end
+
       assert EthereumJSONRPC.Parity.fetch_internal_transactions(
                [
                  %{
@@ -68,12 +126,12 @@ defmodule EthereumJSONRPC.ParityTest do
                {:error,
                 [
                   %{
-                    :code => -32603,
-                    :data => %{
+                    code: -32603,
+                    data: %{
                       "blockNumber" => 1,
                       "transactionHash" => "0x0000000000000000000000000000000000000000000000000000000000000001"
                     },
-                    :message =>
+                    message:
                       "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
                   }
                 ]}
@@ -82,6 +140,40 @@ defmodule EthereumJSONRPC.ParityTest do
     test "with a mix of valid and invalid transaction_params returns {:error, reasons}", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               id: 0,
+               result: %{
+                 "trace" => []
+               }
+             },
+             %{
+               id: 1,
+               result: %{
+                 "trace" => []
+               }
+             },
+             %{
+               id: 2,
+               error: %{
+                 code: -32603,
+                 message: "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
+               }
+             },
+             %{
+               id: 3,
+               error: %{
+                 code: -32603,
+                 message: "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
+               }
+             }
+           ]}
+        end)
+      end
+
       assert EthereumJSONRPC.Parity.fetch_internal_transactions(
                [
                  # start with :ok
@@ -99,11 +191,6 @@ defmodule EthereumJSONRPC.ParityTest do
                    block_number: 1,
                    hash_data: "0x0000000000000000000000000000000000000000000000000000000000000001"
                  },
-                 # :error, :ok clause
-                 %{
-                   block_number: 35,
-                   hash_data: "0x6b80a90c958fb5791a070929379ed6eb7a33ecdf9f9cafcada2f6803b3f25ec3"
-                 },
                  # :error, :error clause
                  %{
                    block_number: 2,
@@ -115,30 +202,21 @@ defmodule EthereumJSONRPC.ParityTest do
                {:error,
                 [
                   %{
-                    :code => -32603,
-                    :data => %{
+                    code: -32603,
+                    data: %{
                       "blockNumber" => 1,
                       "transactionHash" => "0x0000000000000000000000000000000000000000000000000000000000000001"
                     },
-                    :message =>
-                      "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
-                  },
-                  %{
-                    :code => -32603,
-                    :data => %{
-                      "blockNumber" => 35,
-                      "transactionHash" => "0x6b80a90c958fb5791a070929379ed6eb7a33ecdf9f9cafcada2f6803b3f25ec3"
-                    },
-                    :message =>
+                    message:
                       "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
                   },
                   %{
-                    :code => -32603,
-                    :data => %{
+                    code: -32603,
+                    data: %{
                       "blockNumber" => 2,
                       "transactionHash" => "0x0000000000000000000000000000000000000000000000000000000000000002"
                     },
-                    :message =>
+                    message:
                       "Internal error occurred: {}, this should not be the case with eth_call, most likely a bug."
                   }
                 ]}

apps/ethereum_jsonrpc/test/ethereum_jsonrpc/receipts_test.exs

@@ -1,102 +1,134 @@
 defmodule EthereumJSONRPC.ReceiptsTest do
   use ExUnit.Case, async: true
+  use EthereumJSONRPC.Case
 
-  alias EthereumJSONRPC.Receipts
-
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
-
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  import EthereumJSONRPC, only: [integer_to_quantity: 1]
+  import Mox
 
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
-      end
+  alias EthereumJSONRPC.Receipts
 
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
-  end
+  setup :verify_on_exit!
 
   doctest Receipts
 
   describe "fetch/2" do
     test "with receipts and logs", %{json_rpc_named_arguments: json_rpc_named_arguments} do
-      case Keyword.fetch!(json_rpc_named_arguments, :variant) do
-        EthereumJSONRPC.Geth ->
-          assert {:ok,
-                  %{
-                    logs: [],
-                    receipts: [
-                      %{
-                        cumulative_gas_used: 1_238_877,
-                        gas_used: 21000,
-                        status: :ok,
-                        transaction_hash: "0x360fb62cc817093e5624468735803ea39cad719e5c68ca322bae6ba4f520756f",
-                        transaction_index: 57
-                      }
-                    ]
-                  }} =
-                   Receipts.fetch(
-                     [
-                       %{
-                         gas: 90000,
-                         hash: "0x360fb62cc817093e5624468735803ea39cad719e5c68ca322bae6ba4f520756f"
-                       }
-                     ],
-                     json_rpc_named_arguments
-                   )
+      %{
+        cumulative_gas_used: cumulative_gas_used,
+        gas_used: gas_used,
+        address_hash: address_hash,
+        block_number: block_number,
+        data: data,
+        index: index,
+        first_topic: first_topic,
+        status: status,
+        type: type,
+        transaction_hash: transaction_hash,
+        transaction_index: transaction_index
+      } =
+        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+          EthereumJSONRPC.Geth ->
+            %{
+              cumulative_gas_used: 884_322,
+              address_hash: "0x1e2fbe6be9eb39fc894d38be976111f332172d83",
+              block_number: 3_560_000,
+              data:
+                "0x00000000000000000000000033066f6a8adf2d4f5db193524b6fbae062ec0d110000000000000000000000000000000000000000000000000000000000001030",
+              index: 12,
+              first_topic: "0xf6db2bace4ac8277384553ad9603d045220a91fb2448ab6130d7a6f044f9a8cf",
+              gas_used: 106_025,
+              status: :error,
+              type: nil,
+              transaction_hash: "0xd3efddbbeb6ad8d8bb3f6b8c8fb6165567e9dd868013146bdbeb60953c82822a",
+              transaction_index: 17
+            }
 
-        EthereumJSONRPC.Parity ->
-          assert {:ok,
-                  %{
-                    logs: [
-                      %{
-                        address_hash: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b",
-                        data: "0x000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
-                        first_topic: "0x600bcf04a13e752d1e3670a5a9f1c21177ca2a93c6f5391d4f1298d098097c22",
-                        fourth_topic: nil,
-                        index: 0,
-                        second_topic: nil,
-                        third_topic: nil,
-                        transaction_hash: "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5",
-                        type: "mined"
-                      }
-                    ],
-                    receipts: [
-                      %{
-                        cumulative_gas_used: 50450,
-                        gas_used: 50450,
-                        status: :ok,
-                        transaction_hash: "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5",
-                        transaction_index: 0
-                      }
-                    ]
-                  }} =
-                   Receipts.fetch(
-                     [
-                       %{
-                         gas: 50451,
-                         hash: "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5"
-                       }
-                     ],
-                     json_rpc_named_arguments
-                   )
+          EthereumJSONRPC.Parity ->
+            %{
+              cumulative_gas_used: 50450,
+              gas_used: 50450,
+              address_hash: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b",
+              block_number: 37,
+              data: "0x000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
+              index: 0,
+              first_topic: "0x600bcf04a13e752d1e3670a5a9f1c21177ca2a93c6f5391d4f1298d098097c22",
+              status: :ok,
+              type: "mined",
+              transaction_hash: "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5",
+              transaction_index: 0
+            }
+        end
+
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        native_status =
+          case status do
+            :ok -> "0x1"
+            :error -> "0x0"
+          end
 
-        variant ->
-          raise ArgumentError, "Unsupported variant (#{variant})"
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               id: 0,
+               result: %{
+                 "cumulativeGasUsed" => integer_to_quantity(cumulative_gas_used),
+                 "gasUsed" => integer_to_quantity(gas_used),
+                 "logs" => [
+                   %{
+                     "address" => address_hash,
+                     "blockNumber" => integer_to_quantity(block_number),
+                     "data" => data,
+                     "logIndex" => integer_to_quantity(index),
+                     "topics" => [first_topic],
+                     "transactionHash" => transaction_hash,
+                     "type" => type
+                   }
+                 ],
+                 "status" => native_status,
+                 "transactionHash" => transaction_hash,
+                 "transactionIndex" => integer_to_quantity(transaction_index)
+               }
+             }
+           ]}
+        end)
       end
+
+      assert {:ok,
+              %{
+                logs: [
+                  %{
+                    address_hash: ^address_hash,
+                    block_number: ^block_number,
+                    data: ^data,
+                    first_topic: ^first_topic,
+                    fourth_topic: nil,
+                    index: ^index,
+                    second_topic: nil,
+                    third_topic: nil,
+                    transaction_hash: ^transaction_hash
+                  }
+                  | _
+                ],
+                receipts: [
+                  %{
+                    cumulative_gas_used: ^cumulative_gas_used,
+                    gas_used: ^gas_used,
+                    status: ^status,
+                    transaction_hash: ^transaction_hash,
+                    transaction_index: ^transaction_index
+                  }
+                ]
+              }} =
+               Receipts.fetch(
+                 [
+                   %{
+                     gas: 9000,
+                     hash: transaction_hash
+                   }
+                 ],
+                 json_rpc_named_arguments
+               )
     end
   end
 end

apps/ethereum_jsonrpc/test/support/ethereum_jsonrpc/case.ex

@@ -1,10 +1,79 @@
 defmodule EthereumJSONRPC.Case do
+  @moduledoc """
+  Adds `json_rpc_named_arguments` to context.
+
+  Reads `ETHEREUM_JSONRPC_TRANSPORT` environment variable to determine which module to use `:json_rpc_named_arguments`
+  `:transport`:
+
+  * `EthereumJSONRPC.HTTP` - Allow testing of HTTP-only behavior like status codes
+  * `EthereumJSONRPC.Mox` - mock, transport neutral responses.  The default for local testing.
+
+  When `ETHEREUM_JSONRPC_TRANSPORT` is `EthereumJSONRPC.HTTP`, then reads `ETHEREUM_JSONRPC_HTTP_URL` environment
+  variable to determine `:json_rpc_named_arguments` `:transport_options` `:url`.  Failure to set
+  `ETHEREUM_JSONRPC_HTTP_URL` in this case will raise an `ArgumentError`.
+
+  * `EthereumJSONRPC.HTTP.HTTPoison` - HTTP responses from calls to real chain URLs
+  * `EthereumJSONRPC.HTTP.Mox` - mock HTTP responses, so can be used for HTTP-only behavior like status codes.
+
+  """
+
+  use ExUnit.CaseTemplate
+
   require Logger
 
+  setup do
+    transport = transport()
+
+    transport_options =
+      case transport do
+        EthereumJSONRPC.HTTP ->
+          [
+            http: EthereumJSONRPC.HTTP.Case.http(),
+            url: EthereumJSONRPC.HTTP.Case.url(),
+            http_options: EthereumJSONRPC.HTTP.Case.http_options()
+          ]
+
+        _ ->
+          []
+      end
+
+    %{
+      json_rpc_named_arguments: [
+        transport: transport,
+        transport_options: transport_options,
+        variant: variant()
+      ]
+    }
+  end
+
   def log_bad_gateway(under_test, assertions) do
     case under_test.() do
       {:error, {:bad_gateway, url}} -> Logger.error(fn -> ["Bad Gateway to ", url, ".  Check CloudFlare."] end)
       other -> assertions.(other)
     end
   end
+
+  def module(environment_variable, default) do
+    alias =
+      environment_variable
+      |> System.get_env()
+      |> Kernel.||(default)
+
+    module = Module.concat([alias])
+
+    with {:error, reason} <- Code.ensure_loaded(module) do
+      raise ArgumentError,
+            "Could not load `#{environment_variable}` environment variable module (#{module}) due to #{reason}"
+    end
+
+    module
+  end
+
+  def transport do
+    module("ETHEREUM_JSONRPC_TRANSPORT", "EthereumJSONRPC.Mox")
+  end
+
+  def variant do
+    module("ETHEREUM_JSONRPC_VARIANT", "EthereumJSONRPC.Parity")
+  end
 end

apps/ethereum_jsonrpc/test/support/ethereum_jsonrpc/http/case.ex

@@ -0,0 +1,32 @@
+defmodule EthereumJSONRPC.HTTP.Case do
+  use ExUnit.CaseTemplate
+
+  import EthereumJSONRPC.Case, only: [module: 2]
+
+  setup do
+    %{
+      json_rpc_named_arguments: [
+        transport: EthereumJSONRPC.HTTP,
+        transport_options: [
+          http: http(),
+          url: url(),
+          http_options: http_options()
+        ]
+      ]
+    }
+  end
+
+  def http do
+    module("ETHEREUM_JSONRPC_HTTP", "EthereumJSONRPC.HTTP.Mox")
+  end
+
+  def http_options do
+    [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
+  end
+
+  def url do
+    "ETHEREUM_JSONRPC_HTTP_URL"
+    |> System.get_env()
+    |> Kernel.||("https://example.com")
+  end
+end

apps/ethereum_jsonrpc/test/test_helper.exs

@@ -6,5 +6,9 @@ File.mkdir_p!(junit_folder)
 # Counter `test --no-start`.  `--no-start` is needed for `:indexer` compatibility
 {:ok, _} = Application.ensure_all_started(:ethereum_jsonrpc)
 
+Mox.defmock(EthereumJSONRPC.Mox, for: EthereumJSONRPC.Transport)
+# for when we need to simulate HTTP-specific stuff like 413 Request Entity Too Large
+Mox.defmock(EthereumJSONRPC.HTTP.Mox, for: EthereumJSONRPC.HTTP)
+
 ExUnit.configure(formatters: [JUnitFormatter, ExUnit.CLIFormatter])
 ExUnit.start()

apps/explorer/lib/explorer/chain.ex

@@ -2190,8 +2190,7 @@ defmodule Explorer.Chain do
     |> Repo.insert()
   end
 
-  @spec changes_list(params :: map, [{:for, module} | {:with, :atom}]) ::
-          {:ok, changes :: map} | {:error, [Changeset.t()]}
+  @spec changes_list(params :: [map], [{:for, module} | {:with, atom}]) :: {:ok, [map]} | {:error, [Changeset.t()]}
   defp changes_list(params, options) when is_list(options) do
     ecto_schema_module = Keyword.fetch!(options, :for)
     changeset_function_name = Keyword.get(options, :with, :changeset)
@@ -2395,7 +2394,7 @@ defmodule Explorer.Chain do
     Repo.transaction(multi, timeout: Keyword.get(options, :timeout, @transaction_timeout))
   end
 
-  @spec insert_internal_transactions([map()], [timestamps_option]) ::
+  @spec insert_internal_transactions([map], [timeout_option | timestamps_option]) ::
           {:ok, [%{index: non_neg_integer, transaction_hash: Hash.t()}]}
           | {:error, [Changeset.t()]}
   defp insert_internal_transactions(changes_list, named_arguments)

apps/indexer/config/config.exs

@@ -6,8 +6,6 @@ config :indexer,
   debug_logs: !!System.get_env("DEBUG_INDEXER"),
   ecto_repos: [Explorer.Repo]
 
-variant = System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity"
-
-# Import variant specific config. This must remain at the bottom
+# Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
-import_config "#{variant}.exs"
+import_config "#{Mix.env()}.exs"

apps/indexer/config/dev.exs

@@ -0,0 +1,7 @@
+use Mix.Config
+
+variant = System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity"
+
+# Import variant specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "dev/#{variant}.exs"

apps/indexer/config/dev/geth.exs

@@ -8,6 +8,6 @@ config :indexer,
       http: EthereumJSONRPC.HTTP.HTTPoison,
       url: "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY",
       http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-    ]
-  ],
-  variant: EthereumJSONRPC.Geth
+    ],
+    variant: EthereumJSONRPC.Geth
+  ]

apps/indexer/config/dev/parity.exs

@@ -12,6 +12,6 @@ config :indexer,
         trace_replayTransaction: "https://sokol-trace.poa.network"
       ],
       http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-    ]
-  ],
-  variant: EthereumJSONRPC.Parity
+    ],
+    variant: EthereumJSONRPC.Parity
+  ]

apps/indexer/config/prod.exs

@@ -0,0 +1,7 @@
+use Mix.Config
+
+variant = System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity"
+
+# Import variant specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "dev/#{variant}.exs"

apps/indexer/config/prod/geth.exs

@@ -0,0 +1,13 @@
+use Mix.Config
+
+config :indexer,
+  block_rate: 5_000,
+  json_rpc_named_arguments: [
+    transport: EthereumJSONRPC.HTTP,
+    transport_options: [
+      http: EthereumJSONRPC.HTTP.HTTPoison,
+      url: "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY",
+      http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
+    ],
+    variant: EthereumJSONRPC.Geth
+  ]

apps/indexer/config/prod/parity.exs

@@ -0,0 +1,17 @@
+use Mix.Config
+
+config :indexer,
+  block_rate: 5_000,
+  json_rpc_named_arguments: [
+    transport: EthereumJSONRPC.HTTP,
+    transport_options: [
+      http: EthereumJSONRPC.HTTP.HTTPoison,
+      url: "https://sokol.poa.network",
+      method_to_url: [
+        eth_getBalance: "https://sokol-trace.poa.network",
+        trace_replayTransaction: "https://sokol-trace.poa.network"
+      ],
+      http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
+    ],
+    variant: EthereumJSONRPC.Parity
+  ]

apps/indexer/config/test.exs

@@ -0,0 +1 @@
+use Mix.Config

apps/indexer/mix.exs

@@ -39,7 +39,9 @@ defmodule Indexer.MixProject do
       # JSONRPC access to Parity for `Explorer.Indexer`
       {:ethereum_jsonrpc, in_umbrella: true},
       # Importing to database
-      {:explorer, in_umbrella: true}
+      {:explorer, in_umbrella: true},
+      # Mocking `EthereumJSONRPC.Transport`, so we avoid hitting real chains for local testing
+      {:mox, "~> 0.3.2", only: [:test]}
     ]
   end
 

apps/indexer/test/indexer/address_balance_fetcher_test.exs

@@ -1,45 +1,37 @@
 defmodule Indexer.AddressBalanceFetcherTest do
   # MUST be `async: false` so that {:shared, pid} is set for connection to allow AddressBalanceFetcher's self-send to have
   # connection allowed immediately.
-  use Explorer.DataCase, async: false
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
+
+  import EthereumJSONRPC, only: [integer_to_quantity: 1]
+  import Mox
 
   alias Explorer.Chain.{Address, Hash, Wei}
   alias Indexer.{AddressBalanceFetcher, AddressBalanceFetcherCase}
 
-  setup do
-    start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
+  @moduletag :capture_log
 
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
+  # MUST use global mode because we aren't guaranteed to get `start_supervised`'s pid back fast enough to `allow` it to
+  # use expectations and stubs from test's pid.
+  setup :set_mox_global
 
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  setup :verify_on_exit!
 
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
-      end
+  setup do
+    start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
 
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
+    :ok
   end
 
   describe "init/1" do
     test "fetches unfetched Block miner balance", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      variant = Keyword.fetch!(json_rpc_named_arguments, :variant)
+
       %{block_number: block_number, fetched_balance: fetched_balance, miner_hash_data: miner_hash_data} =
-        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+        case variant do
           EthereumJSONRPC.Geth ->
             %{
               block_number: 201_480,
@@ -58,6 +50,16 @@ defmodule Indexer.AddressBalanceFetcherTest do
             raise ArgumentError, "Unsupported variant (#{variant})"
         end
 
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        block_quantity = integer_to_quantity(block_number)
+
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn [%{id: id, method: "eth_getBalance", params: [^miner_hash_data, ^block_quantity]}],
+                                _options ->
+          {:ok, [%{id: id, result: integer_to_quantity(fetched_balance)}]}
+        end)
+      end
+
       {:ok, miner_hash} = Hash.Address.cast(miner_hash_data)
       miner = insert(:address, hash: miner_hash)
       block = insert(:block, miner: miner, number: block_number)
@@ -81,8 +83,10 @@ defmodule Indexer.AddressBalanceFetcherTest do
     test "fetches unfetched addresses when less than max batch size", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
+      variant = Keyword.fetch!(json_rpc_named_arguments, :variant)
+
       %{block_number: block_number, fetched_balance: fetched_balance, miner_hash_data: miner_hash_data} =
-        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+        case variant do
           EthereumJSONRPC.Geth ->
             %{
               block_number: 201_480,
@@ -101,6 +105,16 @@ defmodule Indexer.AddressBalanceFetcherTest do
             raise ArgumentError, "Unsupported variant (#{variant})"
         end
 
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        block_quantity = integer_to_quantity(block_number)
+
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn [%{id: id, method: "eth_getBalance", params: [^miner_hash_data, ^block_quantity]}],
+                                _options ->
+          {:ok, [%{id: id, result: integer_to_quantity(fetched_balance)}]}
+        end)
+      end
+
       {:ok, miner_hash} = Hash.Address.cast(miner_hash_data)
       miner = insert(:address, hash: miner_hash)
       block = insert(:block, miner: miner, number: block_number)
@@ -121,10 +135,10 @@ defmodule Indexer.AddressBalanceFetcherTest do
 
   describe "async_fetch_balances/1" do
     test "fetches balances for address_hashes", %{json_rpc_named_arguments: json_rpc_named_arguments} do
-      AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+      variant = Keyword.fetch!(json_rpc_named_arguments, :variant)
 
       %{block_number: block_number, fetched_balance: fetched_balance, hash: hash} =
-        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+        case variant do
           EthereumJSONRPC.Geth ->
             %{
               block_number: 201_480,
@@ -150,6 +164,19 @@ defmodule Indexer.AddressBalanceFetcherTest do
             raise ArgumentError, "Unsupported variant (#{variant})"
         end
 
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        block_quantity = integer_to_quantity(block_number)
+        hash_data = to_string(hash)
+
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn [%{id: id, method: "eth_getBalance", params: [^hash_data, ^block_quantity]}],
+                                _options ->
+          {:ok, [%{id: id, result: integer_to_quantity(fetched_balance)}]}
+        end)
+      end
+
+      AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+
       assert :ok = AddressBalanceFetcher.async_fetch_balances([%{block_number: block_number, hash: hash}])
 
       address =
@@ -163,7 +190,6 @@ defmodule Indexer.AddressBalanceFetcherTest do
   end
 
   describe "run/2" do
-    @tag :capture_log
     test "duplicate address hashes the max block_quantity", %{
       json_rpc_named_arguments: json_rpc_named_arguments
     } do
@@ -185,6 +211,13 @@ defmodule Indexer.AddressBalanceFetcherTest do
             raise ArgumentError, "Unsupported variant (#{variant})"
         end
 
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn [%{id: id, method: "eth_getBalance", params: [^hash_data, "0x2"]}], _options ->
+          {:ok, [%{id: id, result: integer_to_quantity(fetched_balance)}]}
+        end)
+      end
+
       case AddressBalanceFetcher.run(
              [%{block_quantity: "0x1", hash_data: hash_data}, %{block_quantity: "0x2", hash_data: hash_data}],
              0,
@@ -209,6 +242,13 @@ defmodule Indexer.AddressBalanceFetcherTest do
     test "duplicate address hashes only retry max block_quantity", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       hash_data = "0x000000000000000000000000000000000"
 
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn [%{id: id, method: "eth_getBalance", params: [^hash_data, "0x2"]}], _options ->
+          {:ok, [%{id: id, error: %{code: 404, message: "Not Found"}}]}
+        end)
+      end
+
       assert AddressBalanceFetcher.run(
                [%{block_quantity: "0x1", hash_data: hash_data}, %{block_quantity: "0x2", hash_data: hash_data}],
                0,

apps/indexer/test/indexer/block_fetcher_test.exs

@@ -1,8 +1,11 @@
 defmodule Indexer.BlockFetcherTest do
   # `async: false` due to use of named GenServer
-  use Explorer.DataCase, async: false
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
 
   import ExUnit.CaptureLog
+  import Mox
+  import EthereumJSONRPC, only: [integer_to_quantity: 1]
   import EthereumJSONRPC.Case
 
   alias Explorer.Chain.{Address, Block, Log, Transaction, Wei}
@@ -17,7 +20,13 @@ defmodule Indexer.BlockFetcherTest do
     Sequence
   }
 
-  @tag capture_log: true
+  @moduletag capture_log: true
+
+  # MUST use global mode because we aren't guaranteed to get `start_supervised`'s pid back fast enough to `allow` it to
+  # use expectations and stubs from test's pid.
+  setup :set_mox_global
+
+  setup :verify_on_exit!
 
   # First block with all schemas to import
   # 37 is determined using the following query:
@@ -37,34 +46,172 @@ defmodule Indexer.BlockFetcherTest do
   #  ON blocks.hash = transactions.block_hash) as blocks
   @first_full_block_number 37
 
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
-
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  describe "start_link/1" do
+    test "starts fetching blocks from latest and goes down", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+          EthereumJSONRPC.Parity ->
+            block_number = 3_416_888
+            block_quantity = integer_to_quantity(block_number)
+
+            EthereumJSONRPC.Mox
+            |> stub(:json_rpc, fn
+              # latest block number to seed starting block number for genesis and realtime tasks
+              %{method: "eth_getBlockByNumber", params: ["latest", false]}, _options ->
+                {:ok,
+                 %{
+                   "author" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+                   "difficulty" => "0xfffffffffffffffffffffffffffffffe",
+                   "extraData" => "0xd583010a068650617269747986312e32362e32826c69",
+                   "gasLimit" => "0x7a1200",
+                   "gasUsed" => "0x0",
+                   "hash" => "0x627baabf5a17c0cfc547b6903ac5e19eaa91f30d9141be1034e3768f6adbc94e",
+                   "logsBloom" =>
+                     "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                   "miner" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+                   "number" => block_quantity,
+                   "parentHash" => "0x006edcaa1e6fde822908783bc4ef1ad3675532d542fce53537557391cfe34c3c",
+                   "receiptsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                   "sealFields" => [
+                     "0x841240b30d",
+                     "0xb84158bc4fa5891934bc94c5dca0301867ce4f35925ef46ea187496162668210bba61b4cda09d7e0dca2f1dd041fad498ced6697aeef72656927f52c55b630f2591c01"
+                   ],
+                   "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                   "signature" =>
+                     "58bc4fa5891934bc94c5dca0301867ce4f35925ef46ea187496162668210bba61b4cda09d7e0dca2f1dd041fad498ced6697aeef72656927f52c55b630f2591c01",
+                   "size" => "0x243",
+                   "stateRoot" => "0x9a8111062667f7b162851a1cbbe8aece5ff12e761b3dcee93b787fcc12548cf7",
+                   "step" => "306230029",
+                   "timestamp" => "0x5b437f41",
+                   "totalDifficulty" => "0x342337ffffffffffffffffffffffffed8d29bb",
+                   "transactions" => [],
+                   "transactionsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                   "uncles" => []
+                 }}
+
+              [%{method: "eth_getBlockByNumber", params: [_, true]} | _] = requests, _options ->
+                {:ok,
+                 Enum.map(requests, fn %{id: id, params: [block_quantity, true]} ->
+                   %{
+                     id: id,
+                     jsonrpc: "2.0",
+                     result: %{
+                       "author" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+                       "difficulty" => "0xfffffffffffffffffffffffffffffffe",
+                       "extraData" => "0xd583010a068650617269747986312e32362e32826c69",
+                       "gasLimit" => "0x7a1200",
+                       "gasUsed" => "0x0",
+                       "hash" =>
+                         Explorer.Factory.block_hash()
+                         |> to_string(),
+                       "logsBloom" =>
+                         "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                       "miner" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+                       "number" => block_quantity,
+                       "parentHash" =>
+                         Explorer.Factory.block_hash()
+                         |> to_string(),
+                       "receiptsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                       "sealFields" => [
+                         "0x841240b30d",
+                         "0xb84158bc4fa5891934bc94c5dca0301867ce4f35925ef46ea187496162668210bba61b4cda09d7e0dca2f1dd041fad498ced6697aeef72656927f52c55b630f2591c01"
+                       ],
+                       "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                       "signature" =>
+                         "58bc4fa5891934bc94c5dca0301867ce4f35925ef46ea187496162668210bba61b4cda09d7e0dca2f1dd041fad498ced6697aeef72656927f52c55b630f2591c01",
+                       "size" => "0x243",
+                       "stateRoot" => "0x9a8111062667f7b162851a1cbbe8aece5ff12e761b3dcee93b787fcc12548cf7",
+                       "step" => "306230029",
+                       "timestamp" => "0x5b437f41",
+                       "totalDifficulty" => "0x342337ffffffffffffffffffffffffed8d29bb",
+                       "transactions" => [],
+                       "transactionsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                       "uncles" => []
+                     }
+                   }
+                 end)}
+
+              [%{method: "eth_getBalance"} | _] = requests, _options ->
+                {:ok, Enum.map(requests, fn %{id: id} -> %{id: id, jsonrpc: "2.0", result: "0x0"} end)}
+            end)
 
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
+          EthereumJSONRPC.Geth ->
+            block_number = 5_950_901
+            block_quantity = integer_to_quantity(block_number)
+
+            EthereumJSONRPC.Mox
+            |> stub(:json_rpc, fn
+              %{method: "eth_getBlockByNumber", params: ["latest", false]}, _options ->
+                {:ok,
+                 %{
+                   "difficulty" => "0xc2550dc5bfc5d",
+                   "extraData" => "0x65746865726d696e652d657538",
+                   "gasLimit" => "0x7a121d",
+                   "gasUsed" => "0x6cc04b",
+                   "hash" => "0x71f484056fec687fd469989426c94c469ff08a28eae9a1865359d64557bb99f6",
+                   "logsBloom" =>
+                     "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",
+                   "miner" => "0xea674fdde714fd979de3edf0f56aa9716b898ec8",
+                   "mixHash" => "0x555275cd0ab4c3b2fe3936843ee25bb67da05ef7dcf17216bc0e382d21d139a0",
+                   "nonce" => "0xa49e42a024600113",
+                   "number" => block_quantity,
+                   "parentHash" => "0xb4357733c59cc6f785542d072a205f4e195f7198f544ea5e01c1b90ef0f914a5",
+                   "receiptsRoot" => "0x17baf8de366fecc1be494bff245be6357ac60a5fe786099dba89983778c8421e",
+                   "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                   "size" => "0x6c7b",
+                   "stateRoot" => "0x79345c692a0bf363e95c37750336c534309b3f3fe8b59712ac1527118070f488",
+                   "timestamp" => "0x5b475377",
+                   "totalDifficulty" => "0x120258e22c69502fc88",
+                   "transactions" => ["0xa4b58d1d1473f4891d9ff91f624dba73611bf1f6e9a60d3ca2dcfc75d2ab185c"],
+                   "transactionsRoot" => "0x5972b7988f667d7e86679322641117e503ea2c1bc5a27822a8a8120fe53f2c8b",
+                   "uncles" => []
+                 }}
+
+              [%{method: "eth_getBlockByNumber", params: [_, true]} | _] = requests, _options ->
+                {:ok,
+                 Enum.map(requests, fn %{id: id, params: [block_quantity, true]} ->
+                   %{
+                     id: id,
+                     jsonrpc: "2.0",
+                     result: %{
+                       "difficulty" => "0xc22479024e55f",
+                       "extraData" => "0x73656f3130",
+                       "gasLimit" => "0x7a121d",
+                       "gasUsed" => "0x7a0527",
+                       "hash" =>
+                         Explorer.Factory.block_hash()
+                         |> to_string(),
+                       "logsBloom" =>
+                         "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",
+                       "miner" => "0xb2930b35844a230f00e51431acae96fe543a0347",
+                       "mixHash" => "0x5e07a58028d2cee7ddbefe245e6d7b5232d997b66cc906b18ad9ad51535ced24",
+                       "nonce" => "0x3d88ebe8031aadf6",
+                       "number" => block_quantity,
+                       "parentHash" =>
+                         Explorer.Factory.block_hash()
+                         |> to_string(),
+                       "receiptsRoot" => "0x5294a8b56be40c0c198aa443664e801bb926d49878f96151849f3ddd0cb5e76d",
+                       "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                       "size" => "0x4796",
+                       "stateRoot" => "0x3755d4b5c9ae3cd58d7a856a46fbe8fb69f0ba93d81e831cd68feb8b61bc3009",
+                       "timestamp" => "0x5b475393",
+                       "totalDifficulty" => "0x120259a450e2527e1e7",
+                       "transactions" => [],
+                       "transactionsRoot" => "0xa71969ed649cd1f21846ab7b4029e79662941cc34cd473aa4590e666920ad2f4",
+                       "uncles" => []
+                     }
+                   }
+                 end)}
+
+              [%{method: "eth_getBalance"} | _] = requests, _options ->
+                {:ok, Enum.map(requests, fn %{id: id} -> %{id: id, jsonrpc: "2.0", result: "0x0"} end)}
+            end)
+
+          variant_name ->
+            raise ArgumentError, "Unsupported variant name (#{variant_name})"
+        end
       end
 
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
-  end
-
-  describe "start_link/1" do
-    test "starts fetching blocks from latest and goes down", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       {:ok, latest_block_number} = EthereumJSONRPC.fetch_block_number_by_tag("latest", json_rpc_named_arguments)
 
       default_blocks_batch_size = BlockFetcher.default_blocks_batch_size()
@@ -76,7 +223,7 @@ defmodule Indexer.BlockFetcherTest do
       start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
       AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
       InternalTransactionFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
-      start_supervised!(BlockFetcher)
+      start_supervised!({BlockFetcher, json_rpc_named_arguments: json_rpc_named_arguments})
 
       wait_for_results(fn ->
         Repo.one!(from(block in Block, where: block.number == ^latest_block_number))
@@ -159,7 +306,7 @@ defmodule Indexer.BlockFetcherTest do
       start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
       AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
       InternalTransactionFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
-      {:ok, state} = BlockFetcher.init([])
+      {:ok, state} = BlockFetcher.init(json_rpc_named_arguments: json_rpc_named_arguments)
 
       %{state: state}
     end
@@ -168,6 +315,118 @@ defmodule Indexer.BlockFetcherTest do
       json_rpc_named_arguments: json_rpc_named_arguments,
       state: state
     } do
+      block_number = 0
+
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        block_quantity = integer_to_quantity(block_number)
+        miner_hash = "0x0000000000000000000000000000000000000000"
+
+        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+          EthereumJSONRPC.Parity ->
+            EthereumJSONRPC.Mox
+            |> expect(:json_rpc, fn [%{id: id, method: "eth_getBlockByNumber", params: [^block_quantity, true]}],
+                                    _options ->
+              {:ok,
+               [
+                 %{
+                   id: id,
+                   jsonrpc: "2.0",
+                   result: %{
+                     "author" => "0x0000000000000000000000000000000000000000",
+                     "difficulty" => "0x20000",
+                     "extraData" => "0x",
+                     "gasLimit" => "0x663be0",
+                     "gasUsed" => "0x0",
+                     "hash" => "0x5b28c1bfd3a15230c9a46b399cd0f9a6920d432e85381cc6a140b06e8410112f",
+                     "logsBloom" =>
+                       "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                     "miner" => miner_hash,
+                     "number" => block_quantity,
+                     "parentHash" => "0x0000000000000000000000000000000000000000000000000000000000000000",
+                     "receiptsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                     "sealFields" => [
+                       "0x80",
+                       "0xb8410000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+                     ],
+                     "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                     "signature" =>
+                       "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                     "size" => "0x215",
+                     "stateRoot" => "0xfad4af258fd11939fae0c6c6eec9d340b1caac0b0196fd9a1bc3f489c5bf00b3",
+                     "step" => "0",
+                     "timestamp" => "0x0",
+                     "totalDifficulty" => "0x20000",
+                     "transactions" => [],
+                     "transactionsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                     "uncles" => []
+                   }
+                 }
+               ]}
+            end)
+            |> expect(:json_rpc, fn [
+                                      %{
+                                        id: id,
+                                        jsonrpc: "2.0",
+                                        method: "eth_getBalance",
+                                        params: [^miner_hash, ^block_quantity]
+                                      }
+                                    ],
+                                    _options ->
+              {:ok, [%{id: id, jsonrpc: "2.0", result: "0x0"}]}
+            end)
+
+          EthereumJSONRPC.Geth ->
+            EthereumJSONRPC.Mox
+            |> expect(:json_rpc, fn [%{id: id, method: "eth_getBlockByNumber", params: [^block_quantity, true]}],
+                                    _options ->
+              {:ok,
+               [
+                 %{
+                   id: id,
+                   jsonrpc: "2.0",
+                   result: %{
+                     "difficulty" => "0x400000000",
+                     "extraData" => "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa",
+                     "gasLimit" => "0x1388",
+                     "gasUsed" => "0x0",
+                     "hash" => "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3",
+                     "logsBloom" =>
+                       "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                     "miner" => miner_hash,
+                     "mixHash" => "0x0000000000000000000000000000000000000000000000000000000000000000",
+                     "nonce" => "0x0000000000000042",
+                     "number" => block_quantity,
+                     "parentHash" => "0x0000000000000000000000000000000000000000000000000000000000000000",
+                     "receiptsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                     "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                     "size" => "0x21c",
+                     "stateRoot" => "0xd7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544",
+                     "timestamp" => "0x0",
+                     "totalDifficulty" => "0x400000000",
+                     "transactions" => [],
+                     "transactionsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+                     "uncles" => []
+                   }
+                 }
+               ]}
+            end)
+            |> expect(:json_rpc, fn [
+                                      %{
+                                        id: id,
+                                        jsonrpc: "2.0",
+                                        method: "eth_getBalance",
+                                        params: [^miner_hash, ^block_quantity]
+                                      }
+                                    ],
+                                    _options ->
+              {:ok, [%{id: id, jsonrpc: "2.0", result: "0x0"}]}
+            end)
+
+          variant_name ->
+            raise ArgumentError, "Unsupported variant name (#{variant_name})"
+        end
+      end
+
       {:ok, sequence} = Sequence.start_link(first: 0, step: 1)
 
       %{address_hash: address_hash, block_hash: block_hash} =
@@ -201,11 +460,11 @@ defmodule Indexer.BlockFetcherTest do
             }
 
           variant ->
-            raise ArgumenrError, "Unsupported variant (#{variant})"
+            raise ArgumentError, "Unsupported variant (#{variant})"
         end
 
       log_bad_gateway(
-        fn -> BlockFetcher.import_range(0..0, state, sequence) end,
+        fn -> BlockFetcher.import_range(block_number..block_number, state, sequence) end,
         fn result ->
           assert {:ok,
                   %{
@@ -229,10 +488,182 @@ defmodule Indexer.BlockFetcherTest do
       )
     end
 
+    # We can't currently index the whole Ethereum Mainnet, so we don't know what is the first full block.
+    #   Implement when a full block is found for Ethereum Mainnet and remove :no_geth tag
+    @tag :no_geth
     test "can import range with all synchronous imported schemas", %{
       json_rpc_named_arguments: json_rpc_named_arguments,
       state: state
     } do
+      block_number = @first_full_block_number
+
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+          EthereumJSONRPC.Parity ->
+            block_quantity = integer_to_quantity(block_number)
+            from_address_hash = "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca"
+            to_address_hash = "0x8bf38d4764929064f2d4d3a56520a76ab3df415b"
+            transaction_hash = "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5"
+
+            EthereumJSONRPC.Mox
+            |> expect(:json_rpc, fn json, _options ->
+              assert [%{id: id, method: "eth_getBlockByNumber", params: [^block_quantity, true]}] = json
+
+              {:ok,
+               [
+                 %{
+                   id: id,
+                   jsonrpc: "2.0",
+                   result: %{
+                     "author" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+                     "difficulty" => "0xfffffffffffffffffffffffffffffffe",
+                     "extraData" => "0xd5830108048650617269747986312e32322e31826c69",
+                     "gasLimit" => "0x69fe20",
+                     "gasUsed" => "0xc512",
+                     "hash" => "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471bd",
+                     "logsBloom" =>
+                       "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000200000000000000000000020000000000000000200000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                     "miner" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+                     "number" => "0x25",
+                     "parentHash" => "0xc37bbad7057945d1bf128c1ff009fb1ad632110bf6a000aac025a80f7766b66e",
+                     "receiptsRoot" => "0xd300311aab7dcc98c05ac3f1893629b2c9082c189a0a0c76f4f63e292ac419d5",
+                     "sealFields" => [
+                       "0x84120a71de",
+                       "0xb841fcdb570511ec61edda93849bb7c6b3232af60feb2ea74e4035f0143ab66dfdd00f67eb3eda1adddbb6b572db1e0abd39ce00f9b3ccacb9f47973279ff306fe5401"
+                     ],
+                     "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+                     "signature" =>
+                       "fcdb570511ec61edda93849bb7c6b3232af60feb2ea74e4035f0143ab66dfdd00f67eb3eda1adddbb6b572db1e0abd39ce00f9b3ccacb9f47973279ff306fe5401",
+                     "size" => "0x2cf",
+                     "stateRoot" => "0x2cd84079b0d0c267ed387e3895fd1c1dc21ff82717beb1132adac64276886e19",
+                     "step" => "302674398",
+                     "timestamp" => "0x5a343956",
+                     "totalDifficulty" => "0x24ffffffffffffffffffffffffedf78dfd",
+                     "transactions" => [
+                       %{
+                         "blockHash" => "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471bd",
+                         "blockNumber" => "0x25",
+                         "chainId" => "0x4d",
+                         "condition" => nil,
+                         "creates" => nil,
+                         "from" => from_address_hash,
+                         "gas" => "0x47b760",
+                         "gasPrice" => "0x174876e800",
+                         "hash" => transaction_hash,
+                         "input" => "0x10855269000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
+                         "nonce" => "0x4",
+                         "publicKey" =>
+                           "0xe5d196ad4ceada719d9e592f7166d0c75700f6eab2e3c3de34ba751ea786527cb3f6eb96ad9fdfdb9989ff572df50f1c42ef800af9c5207a38b929aff969b5c9",
+                         "r" => "0xa7f8f45cce375bb7af8750416e1b03e0473f93c256da2285d1134fc97a700e01",
+                         "raw" =>
+                           "0xf88a0485174876e8008347b760948bf38d4764929064f2d4d3a56520a76ab3df415b80a410855269000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef81bea0a7f8f45cce375bb7af8750416e1b03e0473f93c256da2285d1134fc97a700e01a01f87a076f13824f4be8963e3dffd7300dae64d5f23c9a062af0c6ead347c135f",
+                         "s" => "0x1f87a076f13824f4be8963e3dffd7300dae64d5f23c9a062af0c6ead347c135f",
+                         "standardV" => "0x1",
+                         "to" => to_address_hash,
+                         "transactionIndex" => "0x0",
+                         "v" => "0xbe",
+                         "value" => "0x0"
+                       }
+                     ],
+                     "transactionsRoot" => "0x68e314a05495f390f9cd0c36267159522e5450d2adf254a74567b452e767bf34",
+                     "uncles" => []
+                   }
+                 }
+               ]}
+            end)
+            |> expect(:json_rpc, fn json, _options ->
+              assert [
+                       %{
+                         id: id,
+                         method: "eth_getTransactionReceipt",
+                         params: ["0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5"]
+                       }
+                     ] = json
+
+              {:ok,
+               [
+                 %{
+                   id: id,
+                   jsonrpc: "2.0",
+                   result: %{
+                     "blockHash" => "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471bd",
+                     "blockNumber" => "0x25",
+                     "contractAddress" => nil,
+                     "cumulativeGasUsed" => "0xc512",
+                     "gasUsed" => "0xc512",
+                     "logs" => [
+                       %{
+                         "address" => "0x8bf38d4764929064f2d4d3a56520a76ab3df415b",
+                         "blockHash" => "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471bd",
+                         "blockNumber" => "0x25",
+                         "data" => "0x000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
+                         "logIndex" => "0x0",
+                         "topics" => ["0x600bcf04a13e752d1e3670a5a9f1c21177ca2a93c6f5391d4f1298d098097c22"],
+                         "transactionHash" => "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5",
+                         "transactionIndex" => "0x0",
+                         "transactionLogIndex" => "0x0",
+                         "type" => "mined"
+                       }
+                     ],
+                     "logsBloom" =>
+                       "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000200000000000000000000020000000000000000200000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+                     "root" => nil,
+                     "status" => "0x1",
+                     "transactionHash" => "0x53bd884872de3e488692881baeec262e7b95234d3965248c39fe992fffd433e5",
+                     "transactionIndex" => "0x0"
+                   }
+                 }
+               ]}
+            end)
+            # async requests need to be grouped in one expect because the order is non-deterministic while multiple expect
+            # calls on the same name/arity are used in order
+            |> expect(:json_rpc, 5, fn json, _options ->
+              [request] = json
+
+              case request do
+                %{id: id, method: "eth_getBalance", params: [^to_address_hash, ^block_quantity]} ->
+                  {:ok, [%{id: id, jsonrpc: "2.0", result: "0x1"}]}
+
+                %{id: id, method: "eth_getBalance", params: [^from_address_hash, ^block_quantity]} ->
+                  {:ok, [%{id: id, jsonrpc: "2.0", result: "0xd0d4a965ab52d8cd740000"}]}
+
+                %{id: id, method: "trace_replayTransaction", params: [^transaction_hash, ["trace"]]} ->
+                  {:ok,
+                   [
+                     %{
+                       id: id,
+                       jsonrpc: "2.0",
+                       result: %{
+                         "output" => "0x",
+                         "stateDiff" => nil,
+                         "trace" => [
+                           %{
+                             "action" => %{
+                               "callType" => "call",
+                               "from" => from_address_hash,
+                               "gas" => "0x475ec8",
+                               "input" => "0x10855269000000000000000000000000862d67cb0773ee3f8ce7ea89b328ffea861ab3ef",
+                               "to" => to_address_hash,
+                               "value" => "0x0"
+                             },
+                             "result" => %{"gasUsed" => "0x6c7a", "output" => "0x"},
+                             "subtraces" => 0,
+                             "traceAddress" => [],
+                             "type" => "call"
+                           }
+                         ],
+                         "vmTrace" => nil
+                       }
+                     }
+                   ]}
+              end
+            end)
+
+          variant ->
+            raise ArgumentError, "Unsupported variant (#{variant})"
+        end
+      end
+
       {:ok, sequence} = Sequence.start_link(first: 0, step: 1)
 
       case Keyword.fetch!(json_rpc_named_arguments, :variant) do
@@ -372,7 +803,7 @@ defmodule Indexer.BlockFetcherTest do
                             57, 101, 36, 140, 57, 254, 153, 47, 255, 212, 51, 229>>
                       }
                     ]
-                  }} = BlockFetcher.import_range(@first_full_block_number..@first_full_block_number, state, sequence)
+                  }} = BlockFetcher.import_range(block_number..block_number, state, sequence)
 
           wait_for_tasks(InternalTransactionFetcher)
           wait_for_tasks(AddressBalanceFetcher)
@@ -385,12 +816,12 @@ defmodule Indexer.BlockFetcherTest do
           first_address = Repo.get!(Address, first_address_hash)
 
           assert first_address.fetched_balance == %Wei{value: Decimal.new(1)}
-          assert first_address.fetched_balance_block_number == @first_full_block_number
+          assert first_address.fetched_balance_block_number == block_number
 
           second_address = Repo.get!(Address, second_address_hash)
 
           assert second_address.fetched_balance == %Wei{value: Decimal.new(252_460_837_000_000_000_000_000_000)}
-          assert second_address.fetched_balance_block_number == @first_full_block_number
+          assert second_address.fetched_balance_block_number == block_number
 
         variant ->
           raise ArgumentError, "Unsupport variant (#{variant})"
@@ -423,8 +854,8 @@ defmodule Indexer.BlockFetcherTest do
     return
   end
 
-  defp state(_) do
-    {:ok, state} = BlockFetcher.init([])
+  defp state(%{json_rpc_named_arguments: json_rpc_named_arguments}) do
+    {:ok, state} = BlockFetcher.init(json_rpc_named_arguments: json_rpc_named_arguments)
 
     %{state: state}
   end

apps/indexer/test/indexer/internal_transaction_fetcher_test.exs

@@ -1,54 +1,74 @@
 defmodule Indexer.InternalTransactionFetcherTest do
-  use Explorer.DataCase, async: false
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
 
   import ExUnit.CaptureLog
+  import Mox
 
-  alias Indexer.{AddressBalanceFetcherCase, InternalTransactionFetcher}
+  alias Indexer.{AddressBalanceFetcherCase, InternalTransactionFetcher, PendingTransactionFetcher}
 
-  @moduletag :capture_log
+  # MUST use global mode because we aren't guaranteed to get PendingTransactionFetcher's pid back fast enough to `allow`
+  # it to use expectations and stubs from test's pid.
+  setup :set_mox_global
 
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
+  setup :verify_on_exit!
 
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  @moduletag [capture_log: true, no_geth: true]
+
+  test "does not try to fetch pending transactions from Indexer.PendingTransactionFetcher", %{
+    json_rpc_named_arguments: json_rpc_named_arguments
+  } do
+    if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+      case Keyword.fetch!(json_rpc_named_arguments, :variant) do
+        EthereumJSONRPC.Parity ->
+          EthereumJSONRPC.Mox
+          |> expect(:json_rpc, fn _json, _options ->
+            {:ok,
+             [
+               %{
+                 "blockHash" => nil,
+                 "blockNumber" => nil,
+                 "chainId" => "0x4d",
+                 "condition" => nil,
+                 "creates" => "0xffc87239eb0267bc3ca2cd51d12fbf278e02ccb4",
+                 "from" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+                 "gas" => "0x47b760",
+                 "gasPrice" => "0x174876e800",
+                 "hash" => "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+                 "input" =>
+                   "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",
+                 "nonce" => "0x0",
+                 "publicKey" =>
+                   "0xe5d196ad4ceada719d9e592f7166d0c75700f6eab2e3c3de34ba751ea786527cb3f6eb96ad9fdfdb9989ff572df50f1c42ef800af9c5207a38b929aff969b5c9",
+                 "r" => "0xad3733df250c87556335ffe46c23e34dbaffde93097ef92f52c88632a40f0c75",
+                 "raw" =>
+                   "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",
+                 "s" => "0x72caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3",
+                 "standardV" => "0x0",
+                 "to" => nil,
+                 "transactionIndex" => nil,
+                 "v" => "0xbd",
+                 "value" => "0x0"
+               }
+             ]}
+          end)
+          |> stub(:json_rpc, fn _json, _options ->
+            {:ok, []}
+          end)
 
         variant_name ->
           raise ArgumentError, "Unsupported variant name (#{variant_name})"
       end
+    end
 
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
-  end
-
-  @tag :no_geth
-  test "does not try to fetch pending transactions from Indexer.PendingTransactionFetcher", %{
-    json_rpc_named_arguments: json_rpc_named_arguments
-  } do
     start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
     AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
-    start_supervised!({Indexer.PendingTransactionFetcher, json_rpc_named_arguments: json_rpc_named_arguments})
+    start_supervised!({PendingTransactionFetcher, json_rpc_named_arguments: json_rpc_named_arguments})
 
     wait_for_results(fn ->
       Repo.one!(from(transaction in Explorer.Chain.Transaction, where: is_nil(transaction.block_hash), limit: 1))
     end)
 
-    :transaction
-    |> insert(hash: "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6")
-    |> with_block()
-
     hash_strings =
       InternalTransactionFetcher.init([], fn hash_string, acc -> [hash_string | acc] end, json_rpc_named_arguments)
 
@@ -102,6 +122,12 @@ defmodule Indexer.InternalTransactionFetcherTest do
 
   describe "run/2" do
     test "duplicate transaction hashes are logged", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, [%{id: 0, result: %{"trace" => []}}]}
+        end)
+      end
+
       start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
       AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 
@@ -127,8 +153,13 @@ defmodule Indexer.InternalTransactionFetcherTest do
                """
     end
 
-    @tag :no_geth
     test "duplicate transaction hashes only retry uniques", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        expect(EthereumJSONRPC.Mox, :json_rpc, fn _json, _options ->
+          {:ok, [%{id: 0, error: %{code: -32602, message: "Invalid params"}}]}
+        end)
+      end
+
       start_supervised!({Task.Supervisor, name: Indexer.TaskSupervisor})
       AddressBalanceFetcherCase.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 

apps/indexer/test/indexer/pending_transaction_fetcher_test.exs

@@ -1,39 +1,60 @@
 defmodule Indexer.PendingTransactionFetcherTest do
   # `async: false` due to use of named GenServer
-  use Explorer.DataCase, async: false
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
 
-  setup do
-    {variant, url} =
-      case System.get_env("ETHEREUM_JSONRPC_VARIANT") || "parity" do
-        "geth" ->
-          {EthereumJSONRPC.Geth, "https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY"}
+  import Mox
 
-        "parity" ->
-          {EthereumJSONRPC.Parity, "https://sokol-trace.poa.network"}
+  alias Explorer.Chain.Transaction
+  alias Indexer.PendingTransactionFetcher
 
-        variant_name ->
-          raise ArgumentError, "Unsupported variant name (#{variant_name})"
-      end
+  # MUST use global mode because we aren't guaranteed to get PendingTransactionFetcher's pid back fast enough to `allow`
+  # it to use expectations and stubs from test's pid.
+  setup :set_mox_global
 
-    %{
-      json_rpc_named_arguments: [
-        transport: EthereumJSONRPC.HTTP,
-        transport_options: [
-          http: EthereumJSONRPC.HTTP.HTTPoison,
-          url: url,
-          http_options: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
-        ],
-        variant: variant
-      ]
-    }
-  end
+  setup :verify_on_exit!
+
+  @moduletag [capture_log: true, no_geth: true]
 
   describe "start_link/1" do
-    @tag :no_geth
     # this test may fail if Sokol so low volume that the pending transactions are empty for too long
     test "starts fetching pending transactions", %{json_rpc_named_arguments: json_rpc_named_arguments} do
-      alias Explorer.Chain.Transaction
-      alias Indexer.PendingTransactionFetcher
+      if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
+        EthereumJSONRPC.Mox
+        |> expect(:json_rpc, fn _json, _options ->
+          {:ok,
+           [
+             %{
+               "blockHash" => nil,
+               "blockNumber" => nil,
+               "chainId" => "0x4d",
+               "condition" => nil,
+               "creates" => "0xffc87239eb0267bc3ca2cd51d12fbf278e02ccb4",
+               "from" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+               "gas" => "0x47b760",
+               "gasPrice" => "0x174876e800",
+               "hash" => "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+               "input" =>
+                 "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",
+               "nonce" => "0x0",
+               "publicKey" =>
+                 "0xe5d196ad4ceada719d9e592f7166d0c75700f6eab2e3c3de34ba751ea786527cb3f6eb96ad9fdfdb9989ff572df50f1c42ef800af9c5207a38b929aff969b5c9",
+               "r" => "0xad3733df250c87556335ffe46c23e34dbaffde93097ef92f52c88632a40f0c75",
+               "raw" =>
+                 "0xf9038d8085174876e8008347b7608080b903396060604052341561000f57600080fd5b336000806101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff1602179055506102db8061005e6000396000f300606060405260043610610062576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff1680630900f01014610067578063445df0ac146100a05780638da5cb5b146100c9578063fdacd5761461011e575b600080fd5b341561007257600080fd5b61009e600480803573ffffffffffffffffffffffffffffffffffffffff16906020019091905050610141565b005b34156100ab57600080fd5b6100b3610224565b6040518082815260200191505060405180910390f35b34156100d457600080fd5b6100dc61022a565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b341561012957600080fd5b61013f600480803590602001909190505061024f565b005b60008060009054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff161415610220578190508073ffffffffffffffffffffffffffffffffffffffff1663fdacd5766001546040518263ffffffff167c010000000000000000000000000000000000000000000000000000000002815260040180828152602001915050600060405180830381600087803b151561020b57600080fd5b6102c65a03f1151561021c57600080fd5b5050505b5050565b60015481565b6000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1681565b6000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff1614156102ac57806001819055505b505600a165627a7a72305820a9c628775efbfbc17477a472413c01ee9b33881f550c59d21bee9928835c854b002981bda0ad3733df250c87556335ffe46c23e34dbaffde93097ef92f52c88632a40f0c75a072caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3",
+               "s" => "0x72caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3",
+               "standardV" => "0x0",
+               "to" => nil,
+               "transactionIndex" => nil,
+               "v" => "0xbd",
+               "value" => "0x0"
+             }
+           ]}
+        end)
+        |> stub(:json_rpc, fn _json, _options ->
+          {:ok, []}
+        end)
+      end
 
       assert Repo.aggregate(Transaction, :count, :hash) == 0
 

apps/indexer/test/test_helper.exs

@@ -14,6 +14,8 @@ end
 # no declared in :applications since it is test-only
 {:ok, _} = Application.ensure_all_started(:ex_machina)
 
+Mox.defmock(EthereumJSONRPC.Mox, for: EthereumJSONRPC.Transport)
+
 ExUnit.configure(formatters: [JUnitFormatter, ExUnit.CLIFormatter])
 ExUnit.start()