Add FakeAdapter to replace reltuple count query during testing

apps/explorer_web/config/test.exs

@@ -11,3 +11,5 @@ config :explorer_web, ExplorerWeb.Endpoint,
 
 # Configure wallaby
 config :wallaby, screenshot_on_failure: true
+
+config :explorer_web, :fake_adapter, ExplorerWeb.FakeAdapter

apps/explorer_web/lib/explorer_web/controllers/chain_controller.ex

@@ -7,9 +7,10 @@ defmodule ExplorerWeb.ChainController do
   alias Explorer.ExchangeRates.Token
   alias Explorer.Market
 
+  @address_count_module Application.get_env(:explorer_web, :fake_adapter) || Chain
+
   def show(conn, _params) do
     transaction_estimated_count = Chain.transaction_estimated_count()
-    address_estimated_count = Chain.address_estimated_count()
 
     transactions =
       Chain.recent_collated_transactions(
@@ -29,7 +30,7 @@ defmodule ExplorerWeb.ChainController do
     render(
       conn,
       "show.html",
-      address_estimated_count: address_estimated_count,
+      address_estimated_count: @address_count_module.address_estimated_count(),
       average_block_time: Chain.average_block_time(),
       blocks: blocks,
       exchange_rate: Market.get_exchange_rate(Explorer.coin()) || Token.null(),

apps/explorer_web/lib/explorer_web/notifier.ex

@@ -8,8 +8,10 @@ defmodule ExplorerWeb.Notifier do
   alias Explorer.ExchangeRates.Token
   alias ExplorerWeb.Endpoint
 
+  @address_count_module Application.get_env(:explorer_web, :fake_adapter) || Chain
+
   def handle_event({:chain_event, :addresses, addresses}) do
-    Endpoint.broadcast("addresses:new_address", "count", %{count: Chain.address_estimated_count()})
+    Endpoint.broadcast("addresses:new_address", "count", %{count: @address_count_module.address_estimated_count()})
 
     addresses
     |> Stream.reject(fn %Address{fetched_balance: fetched_balance} -> is_nil(fetched_balance) end)

apps/explorer_web/test/explorer_web/features/viewing_chain_test.exs

@@ -3,7 +3,6 @@ defmodule ExplorerWeb.ViewingChainTest do
 
   use ExplorerWeb.FeatureCase, async: true
 
-  alias Explorer.Chain
   alias ExplorerWeb.{AddressPage, BlockPage, ChainPage, Notifier, TransactionPage}
 
   setup do
@@ -52,7 +51,7 @@ defmodule ExplorerWeb.ViewingChainTest do
     end
 
     test "address count live updates", %{session: session} do
-      count = Chain.address_estimated_count()
+      count = ExplorerWeb.FakeAdapter.address_estimated_count()
 
       session
       |> ChainPage.visit_page()

apps/explorer_web/test/support/fake_adapter.ex

@@ -0,0 +1,8 @@
+defmodule ExplorerWeb.FakeAdapter do
+  alias Explorer.Chain.Address
+  alias Explorer.Repo
+
+  def address_estimated_count() do
+    Repo.aggregate(Address, :count, :hash)
+  end
+end