EA attribute specifying whether copy=False is ignored

Author: Aniketsy

pandas/tests/extension/test_numpy.py

@@ -167,6 +167,8 @@ def skip_numpy_object(dtype, request):
 
 
 class TestNumpyExtensionArray(base.ExtensionTests):
+    _supports_fillna_copy_false = False
+
     @pytest.mark.skip(reason="We don't register our dtype")
     # We don't want to register. This test should probably be split in two.
     def test_from_dtype(self, data):