@Test
public void testMakeTwoRandomIds() {

  String id1 = StringUtils.makeRandomId(10);
  String id2 = StringUtils.makeRandomId(10);
  Assert.assertTrue("random id1 had wrong length", id1.length() == 10);
  Assert.assertTrue("random id2 had wrong length", id2.length() == 10);
  Assert.assertTrue("random ids are equal!", !id1.equals(id2));
}