Return controlled errors from genre population

Closes #142

test/music_library/records_test.exs

@@ -344,4 +344,33 @@ defmodule MusicLibrary.RecordsTest do
       assert Assets.get(updated_record.cover_hash).content == expected_content
     end
   end
+
+  describe "populate_genres/1" do
+    test "updates record genres from OpenAI response" do
+      record = record(%{genres: []})
+      genres = ["progressive rock", "art rock", "symphonic rock"]
+
+      Req.Test.stub(OpenAI.API, fn conn ->
+        Req.Test.json(conn, %{
+          "choices" => [
+            %{"message" => %{"content" => JSON.encode!(%{"genres" => genres})}}
+          ]
+        })
+      end)
+
+      assert {:ok, updated} = Records.populate_genres(record)
+      assert updated.genres == genres
+    end
+
+    @tag :capture_log
+    test "returns error tuple when OpenAI API fails" do
+      record = record(%{genres: []})
+
+      Req.Test.stub(OpenAI.API, fn conn ->
+        Plug.Conn.send_resp(conn, 500, JSON.encode!(%{"error" => "internal server error"}))
+      end)
+
+      assert {:error, _reason} = Records.populate_genres(record)
+    end
+  end
 end

test/music_library/worker/populate_genres_test.exs

@@ -0,0 +1,44 @@
+defmodule MusicLibrary.Worker.PopulateGenresTest do
+  use MusicLibrary.DataCase
+
+  import MusicLibrary.Fixtures.Records
+
+  alias MusicLibrary.Records
+  alias MusicLibrary.Worker.PopulateGenres
+
+  describe "perform/1" do
+    test "populates genres and enqueues embedding generation" do
+      record = record(%{genres: []})
+      genres = ["progressive rock", "art rock", "symphonic rock"]
+
+      Req.Test.stub(OpenAI.API, fn conn ->
+        Req.Test.json(conn, %{
+          "choices" => [
+            %{"message" => %{"content" => JSON.encode!(%{"genres" => genres})}}
+          ]
+        })
+      end)
+
+      assert :ok = perform_job(PopulateGenres, %{"id" => record.id})
+
+      updated = Records.get_record!(record.id)
+      assert updated.genres == genres
+
+      assert_enqueued(
+        worker: MusicLibrary.Worker.GenerateRecordEmbedding,
+        args: %{"record_id" => record.id}
+      )
+    end
+
+    @tag :capture_log
+    test "returns error when OpenAI API fails" do
+      record = record(%{genres: []})
+
+      Req.Test.stub(OpenAI.API, fn conn ->
+        Plug.Conn.send_resp(conn, 500, JSON.encode!(%{"error" => "internal server error"}))
+      end)
+
+      assert {:error, _reason} = perform_job(PopulateGenres, %{"id" => record.id})
+    end
+  end
+end