@Test
public void testCompareThrownNull() {

    SeverityComparator a = new SeverityComparator();
    assertEquals(0, a.compareThrowable((Throwable) null, (Throwable) null));
    assertTrue(a.compareThrowable(new Throwable(), (Throwable) null) > 0);
    assertTrue(a.compareThrowable((Throwable) null, new Throwable()) < 0);
}