Method pause

src/tests/fetcher_cache_tests.cpp:997–1004

Stalls the execution of future HTTP requests inside consume().

    // Stalls the execution of future HTTP requests inside consume().
    void pause()
    {
      // If there is no latch or if the existing latch has already been
      // triggered, create a new latch.
      if (latch.get() == nullptr || latch->await(Duration::min())) {
        latch.reset(new Latch());
      }
    }

    void resume()
    {