add test for warning

src/superqt/utils/_throttler.py

@@ -29,6 +29,7 @@ SOFTWARE.
 
 from __future__ import annotations
 
+import warnings
 from concurrent.futures import Future
 from contextlib import suppress
 from enum import IntFlag, auto
@@ -223,6 +224,9 @@ def _weak_func(func: Callable[P, R]) -> Callable[P, R]:
         def weak_func(*args, **kwargs):
             if method := weak_method():
                 return method(*args, **kwargs)
+            warnings.warn(
+                "Method has been garbage collected", RuntimeWarning, stacklevel=2
+            )
 
         return weak_func
 

tests/test_throttler.py

@@ -226,6 +226,12 @@ def test_qthrottled_does_not_prevent_gc(qtbot):
     qtbot.waitUntil(thing.tmethod._future.done, timeout=2000)
     assert mock.call_count == 2
 
+    wm = thing.tmethod
+    assert isinstance(wm, ThrottledCallable)
     del thing
     gc.collect()
     assert thing_ref() is None
+
+    with pytest.warns(RuntimeWarning, match="Method has been garbage collected"):
+        wm()
+        wm._set_future_result()