def METHOD_NAME(self):
    data = ["aknakka;demoA;3;demoB;2", "vesal;demoB;4;demoA;9", "hopohessu;demoC;5"]
    fields = ["demoA = d1"]
    e1 = ["aknakka;d1;3", "vesal;d1;9"]
    r1 = conv_data_field_names(data, fields, ";").to_tim_format()
    self.assertEqual(e1, r1, "Not same in restricted case")