@Test
public void shouldGenerateRandomPermutationOfElementsOfAList() throws Exception {

    List<String> permutation = P25.randomPermutation(Stream.of("a", "b", "c", "d", "e", "f").collect(toList()));
    System.out.println(permutation);
    assertThat(permutation, hasSize(6));
    assertThat(permutation, containsInAnyOrder("a", "b", "c", "d", "e", "f"));
}