chore: add mix files to credo checks (#1423)

* chore: add mix files to credo checks

* chore: fix unused test vars warning

.credo.exs

@@ -30,7 +30,8 @@
           "apps/*/src/",
           "apps/*/test/",
           "apps/*/web/",
-          "priv/migrations/"
+          "priv/migrations/",
+          "mix.exs"
         ],
         excluded: [~r"/_build/", ~r"/deps/", ~r"/node_modules/"]
       },

mix.exs

@@ -1,6 +1,7 @@
 defmodule AeMdw.MixProject do
   use Mix.Project
 
+  @spec project() :: Keyword.t()
   def project() do
     [
       app: :ae_mdw,
@@ -116,6 +117,7 @@ defmodule AeMdw.MixProject do
   # Configuration for the OTP application.
   #
   # Type `mix help compile.app` for more information.
+  @spec application() :: Keyword.t()
   def application() do
     [
       mod: {AeMdw.Application, []},
@@ -126,7 +128,7 @@ defmodule AeMdw.MixProject do
 
   # Specifies which paths to compile per environment.
   defp elixirc_paths(:test), do: ["lib", "test/support"]
-  defp elixirc_paths(_), do: ["lib", "priv/migrations"]
+  defp elixirc_paths(_env), do: ["lib", "priv/migrations"]
 
   # Specifies your project dependencies.
   defp deps() do

test/devmode/ae_mdw_web/contract_controller_test.exs

@@ -13,10 +13,7 @@ defmodule Devmode.AeMdwWeb.ContractControllerTest do
 
   describe "calls" do
     test "it gets a contract's calls", %{conn: conn} do
-      %{
-        "accounts" => [sender_address, recipient_address | _rest],
-        "contracts" => [contract1, contract2 | _rest2]
-      } = DevmodeHelpers.output()
+      %{"contracts" => [contract1 | _rest2]} = DevmodeHelpers.output()
 
       assert %{"data" => [amount_call, chain_create_call | _rest]} =
                conn