@Test
public void testPermutation1() {
final String string = "abc";
final String[] list = StringFunctions.permutations(string);
Assert.assertTrue(list[0].equals("abc"));
Assert.assertTrue(list[5].equals("cba"));
}
@Test
public void testPermutation2() {
final String string = "abcd";
final String[] list = StringFunctions.permutations(string);
Assert.assertTrue(list[0].equals("abcd"));
Assert.assertTrue(list[5].equals("adcb"));
Assert.assertTrue(list[11].equals("bdca"));
Assert.assertTrue(list[17].equals("cdba"));
Assert.assertTrue(list[23].equals("dcba"));
}