Add list episodes tests

Author: koldakov

tests/unit/routers/services/episodes/test_list_episodes.py

@@ -0,0 +1,40 @@
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from futuramaapi.routers.services.episodes.list_episodes import ListEpisodesService
+
+
+@pytest.fixture
+def mock_paginate(request):
+    patcher = patch(
+        "futuramaapi.routers.services.episodes.list_episodes.paginate",
+        new_callable=AsyncMock,
+    )
+    mocked = patcher.start()
+    request.addfinalizer(patcher.stop)
+    return mocked
+
+
+class TestListEpisodesService:
+    @pytest.mark.asyncio
+    async def test_list_episodes_success(
+        self,
+        mock_session_manager,
+        mock_paginate,
+    ):
+        # Arrange
+        page = MagicMock()
+        mock_paginate.return_value = page
+
+        service = ListEpisodesService()
+
+        # Act
+        result = await service()
+
+        # Assert
+        assert result is page
+        mock_paginate.assert_called_once()
+
+        args, _ = mock_paginate.call_args
+        assert args[0] is mock_session_manager