code review fixes

app/tests/test_dl_formats.py

@@ -0,0 +1,21 @@
+import unittest
+
+from app.dl_formats import get_format, get_opts
+
+
+class DlFormatsTests(unittest.TestCase):
+    def test_audio_unknown_format_raises_value_error(self):
+        with self.assertRaises(ValueError):
+            get_format("audio", "auto", "invalid", "best")
+
+    def test_wav_does_not_enable_thumbnail_postprocessing(self):
+        opts = get_opts("audio", "auto", "wav", "best", {})
+        self.assertNotIn("writethumbnail", opts)
+
+    def test_mp3_enables_thumbnail_postprocessing(self):
+        opts = get_opts("audio", "auto", "mp3", "best", {})
+        self.assertTrue(opts.get("writethumbnail"))
+
+
+if __name__ == "__main__":
+    unittest.main()