@Test
public void multiplyIntegers() {
Number actual = evaluate(a._mul(b), intPoint(6, 7));
assertThat(actual.intValue(), equalTo(42));
}
@Test
public void integerPolynomial() {
// a**3 + a*b + 7
Number actual = evaluate(a._mul(a)._mul(a)._plus(a._mul(b))._plus(7), intPoint(3, -8));
assertThat(actual.intValue(), equalTo(10));
}