holder.set(oldValue);
          return updaterFunction.applyAsLong(oldValue);
        });
    return holder.get();
  }

  /**
   * Updates the value currently associated with {@code key} by combining it with {@code x} via the
   * specified accumulator function, returning the new value. The previous value associated with
   * {@code key} (or zero, if there is none) is passed as the first argument to {@code

            .cacheResponse(cacheResponse.stripBody())
            .networkResponse(networkResponse.stripBody())
            .build()

        networkResponse.body.close()

        // Update the cache after combining headers but before stripping the
        // Content-Encoding header (as performed by initContentStream()).
        cache!!.trackConditionalCacheHit()
        cache.update(cacheResponse, response)

    nonePlusA.callStart(FailingCall())
    assertThat(a.takeEvent()).isInstanceOf<CallStart>()
    assertThat(a.eventSequence).isEmpty()
  }

  /** Make sure we didn't mess up our special case for combining aggregates. */
  @Test
  fun moreThanTwoAggregation() {
    val a = EventRecorder(enforceOrder = false)
    val b = EventRecorder(enforceOrder = false)
    val c = EventRecorder(enforceOrder = false)