assertTrue(toTest, toTest.matches(expected));
  }

  @GwtIncompatible // Class names are obfuscated in GWT
  public void testToString_addValueWithNullValue() {
    final String result =
        MoreObjects.toStringHelper(new TestClass())
            .addValue(null)
            .addValue("Hello")
            .addValue(null)
            .toString();