refactor: improve downloader robustness and test coverage

- Add test for cookies_file parameter verification
- Add test for yt-dlp configuration (format, outtmpl, postprocessors)
- Use validator module for robust space_id extraction
- Replace fragile URL splitting with validate_space_url()
- Handles trailing slashes and query parameters correctly

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

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

src/downloader.py

@@ -1,6 +1,7 @@
 import os
 import yt_dlp
 from typing import Optional
+from src.validator import validate_space_url
 
 
 def download_space(
@@ -19,8 +20,13 @@ def download_space(
     Returns:
         Path to the downloaded MP3 file
     """
-    # Extract space ID from URL for filename
-    space_id = space_url.split('/')[-1]
+    # Extract space ID from URL using validator for robustness
+    is_valid, space_id, error_message = validate_space_url(space_url)
+    if not is_valid:
+        raise ValueError(f"Invalid space URL: {error_message}")
+
+    if space_id is None:
+        raise ValueError("Could not extract space ID from URL")
 
     # Configure yt-dlp options
     ydl_opts = {

tests/test_downloader.py

@@ -25,3 +25,61 @@ def test_download_space_basic(tmp_path):
 
         # Verify result contains expected filename
         assert "space_1ZkKzZWnVRRKv" in result
+
+
+def test_download_space_with_cookies(tmp_path):
+    """Test that cookies file is passed to yt-dlp when provided."""
+    space_url = "https://x.com/i/spaces/1ZkKzZWnVRRKv"
+    cookies_path = "/path/to/cookies.txt"
+
+    with patch('src.downloader.yt_dlp.YoutubeDL') as mock_ytdl_class:
+        # Mock the YoutubeDL instance
+        mock_ytdl = Mock()
+        mock_ytdl_class.return_value.__enter__.return_value = mock_ytdl
+        mock_ytdl.extract_info.return_value = {'id': '1ZkKzZWnVRRKv'}
+
+        # Call download_space with cookies
+        result = download_space(
+            space_url=space_url,
+            output_dir=str(tmp_path),
+            cookies_file=cookies_path
+        )
+
+        # Verify YoutubeDL was initialized with correct options
+        call_args = mock_ytdl_class.call_args[0][0]
+        assert 'cookiefile' in call_args
+        assert call_args['cookiefile'] == cookies_path
+
+
+def test_download_space_ytdlp_configuration(tmp_path):
+    """Test that yt-dlp is configured correctly with format, outtmpl, and postprocessors."""
+    space_url = "https://x.com/i/spaces/1ZkKzZWnVRRKv"
+
+    with patch('src.downloader.yt_dlp.YoutubeDL') as mock_ytdl_class:
+        # Mock the YoutubeDL instance
+        mock_ytdl = Mock()
+        mock_ytdl_class.return_value.__enter__.return_value = mock_ytdl
+        mock_ytdl.extract_info.return_value = {'id': '1ZkKzZWnVRRKv'}
+
+        # Call download_space
+        result = download_space(
+            space_url=space_url,
+            output_dir=str(tmp_path),
+            cookies_file=None
+        )
+
+        # Verify YoutubeDL was initialized with correct options
+        call_args = mock_ytdl_class.call_args[0][0]
+
+        # Check format
+        assert call_args['format'] == 'bestaudio/best'
+
+        # Check outtmpl contains the space_id
+        assert 'outtmpl' in call_args
+        assert 'space_1ZkKzZWnVRRKv' in call_args['outtmpl']
+
+        # Check postprocessors for MP3 conversion
+        assert 'postprocessors' in call_args
+        assert len(call_args['postprocessors']) > 0
+        assert call_args['postprocessors'][0]['key'] == 'FFmpegExtractAudio'
+        assert call_args['postprocessors'][0]['preferredcodec'] == 'mp3'