@Test
public void testApplyProxyNormal() {

    //UTE->IE->AE = IE
    SeverityComparator a = new SeverityComparator();
    Throwable next = this.headIeChain(new AssertionError());
    next = new UndeclaredThrowableException(next);
    Throwable reduced = a.apply(next);
    assertEquals(InterruptedException.class, reduced.getClass());
}