def testDeffAndPropCreated(self):
     deff, prop = obtain_data()
     self.assertTrue(isinstance(deff, pd.DataFrame) and
                     isinstance(prop, pd.DataFrame))
 def testPropHasColumnSize(self):
     deff, prop = obtain_data()
     self.assertTrue('Size' in prop.columns)
 def testPropHasColumnZeta_Potential(self):
     deff, prop = obtain_data()
     self.assertTrue('Zeta_Potential' in prop.columns)