@SuppressWarnings({"unchecked", "DoNotMock"}) // mock
  @Override
  public void setUp() throws Exception {
    super.setUp();
    /*
     * Class parameters must be raw, so we can't create a proxy with generic
     * type arguments. The created proxy only records calls and returns null, so
     * the type is irrelevant at runtime.
     */
    mock = mock(Cache.class);
    forward =
        new ForwardingCache<String, Boolean>() {

          final Iterator<ListFrobber> remainingActions = actionsToPerformConcurrently.iterator();

          final Set<List<Integer>> allStates = newHashSet();

          @Override
          public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            return method.equals(getAllStatesMethod)
                ? getAllStates()
                : invokeListMethod(method, args);
          }