String toTest = MoreObjects.toStringHelper(new TestClass()).add("field1", "Hello").toString();
    assertTrue(toTest, toTest.matches(".*\\{field1\\=Hello\\}"));
  }

  public void testToStringLenient_oneIntegerField() {
    String toTest =
        MoreObjects.toStringHelper(new TestClass()).add("field1", Integer.valueOf(42)).toString();
    assertTrue(toTest, toTest.matches(".*\\{field1\\=42\\}"));
  }