def METHOD_NAME(self):
    cat8 = pd.DataFrame(pd.Categorical(np.arange(2**7 - 2)))
    expected_types = ((pd.Categorical, cat8[0].dtype),)
    fbs = encode_matrix_fbs(matrix=cat8, row_idx=None, col_idx=None)
    self.fbs_checks(fbs, (2**7 - 2, 1), expected_types, None)