return peekingIterator(iterator);
      }
    }.test();
  }

  public void testPeekingIteratorBehavesLikeIteratorOnEmptyIterable() {
    actsLikeIteratorHelper(emptyList());
  }

  public void testPeekingIteratorBehavesLikeIteratorOnSingletonIterable() {
    actsLikeIteratorHelper(singletonList(new Object()));
  }

  // TODO(cpovirk): instead of skipping, use a smaller number of steps

        return peekingIterator(iterator);
      }
    }.test();
  }

  public void testPeekingIteratorBehavesLikeIteratorOnEmptyIterable() {
    actsLikeIteratorHelper(emptyList());
  }

  public void testPeekingIteratorBehavesLikeIteratorOnSingletonIterable() {
    actsLikeIteratorHelper(singletonList(new Object()));
  }

  // TODO(cpovirk): instead of skipping, use a smaller number of steps