assertThrows(
        IllegalStateException.class,
        () -> builder.build(CacheLoader.from(Suppliers.ofInstance(null))));
  }

  @SuppressWarnings("ReturnValueIgnored")
  public void testMaximumSize_withWeigher() {
    CacheBuilder<Object, Object> builder = CacheBuilder.from(parse("maximumSize=9000"));
    builder.weigher(constantWeigher(42)).build(CacheLoader.from(Suppliers.ofInstance(null)));
  }