test(macos): add test coverage for CoreFoundation init fallback

Author: ShresthSamyak

tests/test_mpv.py

@@ -1069,3 +1069,44 @@ def test_macos_wait_for_future_timeout(self):
             finally:
                 mpv._core_foundation = orig_cf
                 mpv._cf_runloop_default_mode = orig_mode
+
+    @mock.patch('sys.platform', 'darwin')
+    def test_macos_wait_for_future_fallback(self):
+        future = Future()
+        
+        with mock.patch('threading.current_thread') as mock_current_thread, \
+             mock.patch('threading.main_thread') as mock_main_thread, \
+             mock.patch('ctypes.cdll.LoadLibrary') as mock_load_library, \
+             mock.patch('ctypes.util.find_library') as mock_find_library, \
+             mock.patch('ctypes.c_void_p.in_dll') as mock_in_dll:
+            
+            sentinel = object()
+            mock_current_thread.return_value = sentinel
+            mock_main_thread.return_value = sentinel
+            
+            # Force CoreFoundation init to fail
+            mock_load_library.side_effect = OSError("Library not found")
+            
+            orig_cf = mpv._core_foundation
+            orig_mode = mpv._cf_runloop_default_mode
+            mpv._core_foundation = None
+            mpv._cf_runloop_default_mode = None
+            
+            def resolve_future():
+                time.sleep(0.1)
+                try:
+                    future.set_result('fallback_success')
+                except InvalidStateError:
+                    pass
+                
+            thread = threading.Thread(target=resolve_future)
+            thread.start()
+            try:
+                res = self.m._wait_for_future(future, timeout=1.0)
+                
+                self.assertEqual(res, 'fallback_success')
+                self.assertFalse(mock_in_dll.called)
+            finally:
+                thread.join(timeout=1.0)
+                mpv._core_foundation = orig_cf
+                mpv._cf_runloop_default_mode = orig_mode