@Test
public void test3WTFailure() {

    thrown.expect(UnsupportedOperationException.class);
    thrown.expectMessage("Reduction of three-windings transformers is not supported");
    Network network = ThreeWindingsTransformerNetworkFactory.create();
    NetworkReducer reducer = NetworkReducer.builder()
            .withNetworkPredicate(IdentifierNetworkPredicate.of("VL_132", "VL_11"))
            .withReductionOptions(new ReductionOptions())
            .build();
    reducer.reduce(network);
}