@Test
void find_whenBothRootsAreEqual_thenReturnsCorrectRoots() {

    ImmutableList<Complex> roots = QuadraticRootFinder.find(2, 4, 2);
    ImmutableList<Pair<Double, Double>> expectedRoots = ImmutableList.of(
            Pair.of(-1.0, 0.0),
            Pair.of(-1.0, 0.0)
    );
    assertEquals(expectedRoots, roots);
}