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kivy/tests/test_weakmethod.py

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+import gc
+
+
+def test_weak_method_on_obj():
+    from kivy.weakmethod import WeakMethod
+
+    class SomeClass:
+
+        def do_something(self):
+            pass
+
+    obj = SomeClass()
+    weak_method = WeakMethod(obj.do_something)
+
+    assert not weak_method.is_dead()
+    assert weak_method() == obj.do_something
+    assert weak_method == WeakMethod(obj.do_something)
+    assert weak_method != WeakMethod(SomeClass().do_something)
+
+    del obj
+    gc.collect()
+
+    assert weak_method.is_dead()
+    assert weak_method() is None
+    assert weak_method != WeakMethod(SomeClass().do_something)
+
+
+def test_weak_method_func():
+    from kivy.weakmethod import WeakMethod
+
+    def do_something():
+        pass
+
+    weak_method = WeakMethod(do_something)
+
+    assert not weak_method.is_dead()
+    assert weak_method() == do_something
+    assert weak_method == WeakMethod(do_something)
+
+    del do_something
+    gc.collect()
+
+    assert not weak_method.is_dead()
+    assert weak_method() is not None