handler.getWaitPrecondition().assertCanWait();
            }
        };
    }

    @Override
    public void cancelBlockedRequests() {
        lock.lock();
        try {
            if (current != null) {
                current.cancelBlockedRequests();
            }
        } finally {
            lock.unlock();
        }
    }

    @Override

    @Override
    public void resetExpectations() {
        cancelBlockedRequests();
        waitForRequestsToFinish();
        lock.lock();
        try {
            outcomes.clear();
            handlers.clear();
            completed = true;
        } finally {
            lock.unlock();
        }
    }

    private void cancelBlockedRequests() {
        for (TrackingHttpHandler handler : handlers) {

     */
    WaitPrecondition getWaitPrecondition();

    /**
     * Releases any blocked requests, in preparation for shutdown.
     */
    void cancelBlockedRequests();

    /**
     * Asserts that this handler has been completed successfully.
     */
    void assertComplete(Collection<Throwable> failures);

        return String.format("Waiting for %s further requests, received %s, released %s, not yet received %s", waitingFor, format(received), format(released), format(notReceived));
    }

    @Override
    public void cancelBlockedRequests() {
        lock.lock();
        try {
            cancelled = true;
            condition.signalAll();
        } finally {
            lock.unlock();
        }
    }

    @Override