Add test to MetadataUpdater's GenServer

Co-Authored-By: w-sanches <1727723+w-sanches@users.noreply.github.com>

apps/indexer/test/indexer/token/metadata_updater_test.exs

@@ -8,6 +8,52 @@ defmodule Indexer.Token.MetadataUpdaterTest do
   alias Indexer.Token.MetadataUpdater
 
   setup :verify_on_exit!
+  setup :set_mox_global
+
+  test "updates tokens metadata on start" do
+    insert(:token, name: nil, symbol: nil, decimals: 10, cataloged: true)
+
+    expect(
+      EthereumJSONRPC.Mox,
+      :json_rpc,
+      1,
+      fn [%{id: "decimals"}, %{id: "name"}, %{id: "symbol"}, %{id: "totalSupply"}], _opts ->
+        {:ok,
+         [
+           %{
+             id: "decimals",
+             result: "0x0000000000000000000000000000000000000000000000000000000000000012"
+           },
+           %{
+             id: "name",
+             result:
+               "0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000642616e636f720000000000000000000000000000000000000000000000000000"
+           },
+           %{
+             id: "symbol",
+             result:
+               "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003424e540000000000000000000000000000000000000000000000000000000000"
+           },
+           %{
+             id: "totalSupply",
+             result: "0x0000000000000000000000000000000000000000000000000de0b6b3a7640000"
+           }
+         ]}
+      end
+    )
+
+    pid = start_supervised!({MetadataUpdater, %{update_interval: 0}})
+
+    wait_for_results(fn ->
+      updated = Repo.one!(from(t in Token, where: t.cataloged == true and not is_nil(t.name), limit: 1))
+
+      assert updated.name != nil
+      assert updated.symbol != nil
+    end)
+
+    # Terminates the process so it finishes all Ecto processes.
+    GenServer.stop(pid)
+  end
 
   describe "update_metadata/1" do
     test "updates the metadata for a list of tokens" do