@Test
public void testApplyErrorByNormal() {

    SeverityComparator a = new SeverityComparator();
    Throwable next = this.headIeChain(new AssertionError());
    next = new Error(next);
    next = new NoClassDefFoundError().initCause(next);
    Throwable reduced = a.apply(next);
    assertEquals(Error.class, reduced.getClass());
}