@Test
public void testImportLinesDifferentNominalvoltage() {

    ResourceDataSource dataSource = new ResourceDataSource("differentLinesVoltage", new ResourceSet("/", "differentLinesVoltage.uct"));
    exceptionRule.expect(IllegalArgumentException.class);
    exceptionRule.expectMessage("with two different nominal voltages");
    new UcteImporter().importData(dataSource, null);
}