public static RuntimeException peel(final Throwable t) {
        return (RuntimeException) peel(t, null, null, HAZELCAST_EXCEPTION_WRAPPER);
    }
@Test
    public void testPeel_whenThrowableIsExecutionException_thenReturnCause() {
        RuntimeException result = ExceptionUtil.peel(new ExecutionException(throwable));

        assertEquals(throwable, result);
    }