ByteSourceFactory factory, String string, String name, String desc) {
    TestSuite suite = suiteForBytes(factory, string.getBytes(UTF_8), name, desc, true);
    CharSourceFactory charSourceFactory = SourceSinkFactories.asCharSourceFactory(factory);
    suite.addTest(
        CharSourceTester.suiteForString(
            charSourceFactory, string, name + ".asCharSource[Charset]", desc));
    return suite;
  }

  static TestSuite suiteForBytes(