def test_fillna_inplace(self):
        def test_impl():
            A = np.array([1., 2., 3.])
            A[0] = np.nan
            df = pd.DataFrame({'A': A})
            df.A.fillna(5.0, inplace=True)
            return df.A.sum()

        hpat_func = self.jit(test_impl)
        self.assertEqual(hpat_func(), test_impl())