Remove mox in favour of built-in Req stubs

test/music_brainz_test.exs

@@ -1,22 +1,22 @@
 defmodule MusicBrainzTest do
   use ExUnit.Case, async: true
 
-  alias MusicBrainz.{APIMock, ReleaseSearchResult}
+  alias MusicBrainz.ReleaseGroupSearchResult
   import MusicBrainz.Fixtures.Release
   import MusicBrainz.Fixtures.ReleaseGroup
-  import Mox
-
-  setup :verify_on_exit!
 
   describe "search_release_group/2" do
     test "it returns results with correct limit and offset" do
-      mock_results = release_group_search_results()
+      results = release_group_search_results()
 
-      expect(APIMock, :search_release_group, fn "Marillion", [limit: 20, offset: 10], _config ->
-        {:ok, mock_results}
+      expected_results =
+        Enum.map(results["release-groups"], &ReleaseGroupSearchResult.from_api_response/1)
+
+      Req.Test.stub(MusicBrainz.API, fn conn ->
+        Req.Test.json(conn, results)
       end)
 
-      assert {:ok, mock_results} ==
+      assert {:ok, expected_results} ==
                MusicBrainz.search_release_group("Marillion", limit: 20, offset: 10)
     end
   end
@@ -24,13 +24,16 @@ defmodule MusicBrainzTest do
   describe "search_release_by_barcode/1" do
     test "it returns releases belonging to the same release group" do
       barcode = "5052205070023"
-      releases = releases(:queen_greatest_hits)
 
-      expect(APIMock, :search_release_by_barcode, fn ^barcode, _config ->
-        {:ok, Enum.map(releases, &ReleaseSearchResult.from_api_response/1)}
+      releases =
+        releases(:queen_greatest_hits)
+
+      Req.Test.stub(MusicBrainz.API, fn conn ->
+        Req.Test.json(conn, releases)
       end)
 
-      assert {:ok, results} = MusicBrainz.search_release_by_barcode(barcode)
+      assert {:ok, results} =
+               MusicBrainz.search_release_by_barcode(barcode)
 
       assert Enum.all?(results, fn result ->
                result.release_group.id == "69ce61c8-127f-3809-95d8-62fdf3ae1347" &&