assertTrue(toTest, toTest.matches(".*\\{field1\\=null\\}"));
  }

  @GwtIncompatible // Class names are obfuscated in GWT
  public void testToString_complexFields() {
    Map<String, Integer> map =
        ImmutableMap.<String, Integer>builder().put("abc", 1).put("def", 2).put("ghi", 3).build();
    String toTest =
        MoreObjects.toStringHelper(new TestClass())