chore: import upstream snapshot with attribution

tests/test_generator_protocol.py

@@ -0,0 +1,37 @@
+"""Every video generator must satisfy the VideoGenerator protocol, which
+declares **kwargs: pipelines pass progress= callbacks, and generators that
+reject unknown kwargs crash mid-render (TypeError) on the transition path."""
+
+import inspect
+import unittest
+
+from tools.video_generator_doubao_seedance_yunwu_api import VideoGeneratorDoubaoSeedanceYunwuAPI
+from tools.video_generator_omni_yunwu_api import VideoGeneratorOmniYunwuAPI
+from tools.video_generator_openrouter_api import VideoGeneratorOpenRouterAPI
+from tools.video_generator_veo_google_api import VideoGeneratorVeoGoogleAPI
+from tools.video_generator_veo_yunwu_api import VideoGeneratorVeoYunwuAPI
+
+
+class TestVideoGeneratorProtocol(unittest.TestCase):
+    GENERATORS = [
+        VideoGeneratorDoubaoSeedanceYunwuAPI,
+        VideoGeneratorOmniYunwuAPI,
+        VideoGeneratorOpenRouterAPI,
+        VideoGeneratorVeoGoogleAPI,
+        VideoGeneratorVeoYunwuAPI,
+    ]
+
+    def test_generate_single_video_accepts_arbitrary_kwargs(self):
+        for cls in self.GENERATORS:
+            with self.subTest(cls=cls.__name__):
+                params = inspect.signature(cls.generate_single_video).parameters
+                accepts_var_kwargs = any(p.kind is inspect.Parameter.VAR_KEYWORD for p in params.values())
+                self.assertTrue(
+                    accepts_var_kwargs,
+                    f"{cls.__name__}.generate_single_video must accept **kwargs per tools.protocols.VideoGenerator "
+                    "(pipelines pass progress=...)",
+                )
+
+
+if __name__ == "__main__":
+    unittest.main()