assertThat(anyOf("ab").trimFrom("abacatbab")).isEqualTo("cat");
  }

  private void doTestTrimFrom(String in, String out) {
    // Try a few different matchers which all match '-' and not 'x'
    assertThat(is('-').trimFrom(in)).isEqualTo(out);
    assertThat(is('-').or(is('#')).trimFrom(in)).isEqualTo(out);
    assertThat(isNot('x').trimFrom(in)).isEqualTo(out);

        new LineProcessor<List<String>>() {
          final List<String> collector = new ArrayList<>();

          @Override
          public boolean processLine(String line) {
            collector.add(whitespace().trimFrom(line));
            return true;
          }

          @Override
          public List<String> getResult() {
            return collector;
          }
        };

        new LineProcessor<List<String>>() {
          final List<String> collector = new ArrayList<>();

          @Override
          public boolean processLine(String line) {
            collector.add(whitespace().trimFrom(line));
            return true;
          }

          @Override
          public List<String> getResult() {
            return collector;
          }
        };

  }

  // enum singleton pattern
  private enum TrimStringFunction implements Function<String, String> {
    INSTANCE;

    @Override
    public String apply(String string) {
      return whitespace().trimFrom(string);
    }
  }

  public void testCompose() {
    Function<String, String> trim = TrimStringFunction.INSTANCE;
    Predicate<String> equalsFoo = Predicates.equalTo("Foo");