@Test
public void multiplyTest() {

    int[] valuesA = new int[]{1, 0, 2, 3};
    int[] valuesB = new int[]{0, 1, 3, 2};
    int[] expectC = new int[]{1, 0, 3, 2};
    Permutation a = new Permutation(valuesA);
    Permutation b = new Permutation(valuesB);
    Permutation c = new Permutation(expectC);
    Assert.assertEquals(c, a.multiply(b));
}