.addValue(null)
            .toString();
    final String expected = "TestClass{null, Hello, null}";

    assertEquals(expected, result);
  }

  public void testToStringLenient_addValueWithNullValue() {
    final String result =
        MoreObjects.toStringHelper(new TestClass())
            .addValue(null)
            .addValue("Hello")
            .addValue(null)
            .toString();