@Test public void object_eq_object() { assertEquals(0, comparator.compare("X", "X")); }
@Test public void object_lt_object() { assertTrue(comparator.compare("X", "Y") < 0); }
@Test public void object_gt_object() { assertTrue(comparator.compare("Z", "Y") > 0); }
@Test public void null_before_object() { assertTrue(comparator.compare(null, "X") < 0); }
@Test public void object_after_null() { assertTrue(comparator.compare("X", null) > 0); }