}

            public void remove(String sessionCountId) {
                // No-op
            }
        }, "crawlingConfigHelper");

        // Fast mock SystemHelper with immediate force stop capability
        ComponentUtil.register(new SystemHelper() {
            private final AtomicBoolean forceStop = new AtomicBoolean(false);

            @Override
            public long getCurrentTimeAsLong() {

        assertEquals(messageCode, exception.getMessageCode());
    }

    public void test_verifySerialVersionUID() {
        // Setup
        final String message = "Test serialization capability";
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute

    throwing in 5.0.0, we inadvertently removed the ability for callers to peek the trailers
    (by catching the `IllegalStateException` if they weren't available). This new API restores that
    capability.

 *  Fix: Don't crash on `trailers()` if the response doesn't have a body. We broke [Retrofit] users
    who read the trailers on the `raw()` OkHttp response, after its body was decoded.


## Version 5.0.0