test: [utils] add TestSource.test_to_json

test/test_utils.py

@@ -44,6 +44,10 @@ class TestSource(unittest.TestCase):
         source = utils.Source(self.source, self.path, self.provider)
         self.assertEqual(source.duration(), self._duration)
 
+    def test_to_json(self):
+        source = utils.Source(self.source, self.path, self.provider)
+        self.assertEqual(source.to_json(), {"source": self.source, "path": self.path, "provider": self.provider})
+
     # Sad path tests
     def test_init_no_source(self):
         with self.assertRaises(ValueError):