@Test
void find_whenAllThreeRootsAreReal_thenReturnsCorrectRoots() {

    ImmutableList<Complex> roots = CubicRootFinder.find(2, -4, -22, 24);
    ImmutableList<Pair<Double, Double>> expectedRoots = ImmutableList.of(
            Pair.of(4.0, 0.0),
            Pair.of(1.0, 0.0),
            Pair.of(-3.0, 0.0)
    );
    assertEquals(expectedRoots, roots);
}