doParallelCacheOp(
        count, n -> cache.asMap().compute(key, (k, v) -> n % 2 == 0 ? v + delimiter + n : null));
    assertThat(cache.size()).isAtMost(1);
  }

  public void testCompute() {
    cache.put(key, "1");
    // simultaneous deletion
    doParallelCacheOp(count, n -> cache.asMap().compute(key, (k, v) -> null));
    assertThat(cache.size()).isEqualTo(0);
  }

        .isEqualTo(EntryFactory.WEAK_WRITE);
    assertThat(EntryFactory.getFactory(Strength.WEAK, true, true))
        .isEqualTo(EntryFactory.WEAK_ACCESS_WRITE);
  }

  // computation tests

  public void testCompute() throws ExecutionException {
    CountingLoader loader = new CountingLoader();
    LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder());
    assertThat(loader.getCount()).isEqualTo(0);

        .isEqualTo(EntryFactory.WEAK_WRITE);
    assertThat(EntryFactory.getFactory(Strength.WEAK, true, true))
        .isEqualTo(EntryFactory.WEAK_ACCESS_WRITE);
  }

  // computation tests

  public void testCompute() throws ExecutionException {
    CountingLoader loader = new CountingLoader();
    LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder());
    assertThat(loader.getCount()).isEqualTo(0);