BUG: RecursionError when attempting to replace np.nan values (pandas-dev#45725)

Author: roib20

pandas/tests/frame/methods/test_replace.py

@@ -665,9 +665,9 @@ def test_replace_simple_nested_dict_with_nonexistent_value(self):
     @pytest.mark.parametrize("to_replace, value", [(np.nan, pd.NA), (np.nan, None)])
     def test_replace_numpy_nan(self, dtype, to_replace, value):
         # GH#45725 ensure numpy.nan can be replaced with pandas.NA or None
-        df = pd.DataFrame({"A": [to_replace]}, dtype=dtype)
+        df = DataFrame({"A": [to_replace]}, dtype=dtype)
         result = df.replace({to_replace: value})
-        expected = pd.DataFrame({"A": [value]}, dtype=dtype)
+        expected = DataFrame({"A": [value]}, dtype=dtype)
         tm.assert_frame_equal(result, expected)
 
     def test_replace_value_is_none(self, datetime_frame):