@Test
public void delegatesToInnerProduct() {

    final Vect<Object> first = new FixedVector<>(new Random<>());
    final Vect<Object> second = new FixedVector<>(new Random<>());
    final MkProduct<Object> pdt = new MkProduct<>();
    new VectsDegrees<>(first, second).resolve(pdt);
    final Optional<List<Vect<Object>>> params = pdt.angle();
    MatcherAssert.assertThat(
        "Expecting call to angle method with vectors as parameters",
        params.isPresent() && params.get().get(0).equals(first)
            && params.get().get(1).equals(second)
    );
}