@Test
public void testFactorial() {
assertThat(AlgebraUtil.factorial(0), is(1.0));
assertEquals(9.33262e157, AlgebraUtil.factorial(100), 0.00001e157);
assertException(() -> AlgebraUtil.factorial(-1));
assertException(() -> AlgebraUtil.longFactorial(21));
assertThat(AlgebraUtil.longFactorial(20), is(2432902008176640000L));
}
