test: add integration test for complete workflow

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_integration.py

@@ -0,0 +1,32 @@
+import pytest
+from click.testing import CliRunner
+from src.main import cli
+
+
+@pytest.mark.integration
+def test_full_workflow_with_mocks(tmp_path):
+    """Integration test for complete workflow."""
+    runner = CliRunner()
+
+    from unittest.mock import patch
+
+    with patch('src.downloader.yt_dlp.YoutubeDL') as mock_ytdl_class:
+        # Mock successful download
+        mock_ytdl = mock_ytdl_class.return_value.__enter__.return_value
+        mock_ytdl.extract_info.return_value = {'id': '1ZkKzZWnVRRKv'}
+
+        # Run CLI
+        result = runner.invoke(cli, [
+            'https://x.com/i/spaces/1ZkKzZWnVRRKv',
+            '--output', str(tmp_path)
+        ])
+
+        # Verify success
+        assert result.exit_code == 0
+        assert "Successfully downloaded" in result.output
+
+        # Verify yt-dlp was called correctly
+        mock_ytdl.extract_info.assert_called_once()
+        call_args = mock_ytdl_class.call_args
+        assert 'bestaudio' in call_args[0][0]['format']
+        assert 'mp3' in call_args[0][0]['postprocessors'][0]['preferredcodec']