assertEquals(24L, MemoryUtil.sizeOf(Double.MAX_VALUE));
        assertEquals(24L, MemoryUtil.sizeOf(Byte.MAX_VALUE));
        assertEquals(16L, MemoryUtil.sizeOf(Boolean.TRUE));
        assertEquals(32L, MemoryUtil.sizeOf(new Date()));
        assertEquals(80L, MemoryUtil.sizeOf(LocalDateTime.now()));
        assertEquals(2128L, MemoryUtil.sizeOf(ZonedDateTime.now()));
        assertEquals(66L, MemoryUtil.sizeOf("1234567890"));

    assertThrows(
        IllegalArgumentException.class,
        () -> {
          HashCode unused =
              Hashing.combineOrdered(
                  ImmutableList.of(HashCode.fromInt(32), HashCode.fromLong(32L)));
        });
  }

  public void testCombineOrdered() {
    HashCode hash31 = HashCode.fromInt(31);
    HashCode hash32 = HashCode.fromInt(32);

    //
    // TODO(user): Consider scaling by number of mutator threads,
    // e.g. using Thread#activeCount()
    return max(10L, Runtime.getRuntime().totalMemory() / (32L * 1024L * 1024L));
  }

  /**
   * Waits until the given future {@linkplain Future#isDone is done}, invoking the garbage collector
   * as necessary to try to ensure that this will happen.
   *

    //
    // TODO(user): Consider scaling by number of mutator threads,
    // e.g. using Thread#activeCount()
    return max(10L, Runtime.getRuntime().totalMemory() / (32L * 1024L * 1024L));
  }

  /**
   * Waits until the given future {@linkplain Future#isDone is done}, invoking the garbage collector
   * as necessary to try to ensure that this will happen.
   *