def METHOD_NAME(self):
    obj = self.df.copy(deep=True)
    start_cols = obj.columns
    out = obj.pyrochem.parse_chem()
    self.assertTrue(len(out.columns) == len(start_cols))
    self.assertTrue(
        all([a == b for (a, b) in zip(out.columns, start_cols) if "/" not in a])
    )