@Test
public void resolvesObtuseAngle() {

    final double angle = new Obtuse<>().resolve(new MkProduct<>()).doubleValue();
    MatcherAssert.assertThat(
        angle, Matchers.greaterThanOrEqualTo(Math.PI / 2)
    );
    MatcherAssert.assertThat(angle, Matchers.lessThanOrEqualTo(Math.PI));
}