public void testSplitterIterableIsUnmodifiable_string() {
    assertIteratorIsUnmodifiable(Splitter.on(",").split("a,b").iterator());
  }

  @GwtIncompatible // java.util.regex.Pattern
  public void testSplitterIterableIsUnmodifiable_pattern() {
    assertIteratorIsUnmodifiable(Splitter.on(Pattern.compile(",")).split("a,b").iterator());
  }

  private void assertIteratorIsUnmodifiable(Iterator<?> iterator) {
    iterator.next();