public <T> boolean parse(Handler<T> handler, T target, CharSequence input) {
    if (input == null) throw new NullPointerException("input == null");
    return parse(handler, target, input, 0, input.length());
  }
@Test void toleratesButIgnores_onlyWhitespace() {
    for (String w : Arrays.asList(" ", "\t")) {
      entrySplitter.parse(parseIntoMap, map, w);
      entrySplitter.parse(parseIntoMap, map, w + w);
    }

    assertThat(map.isEmpty());
  }