Predicate<CharSequence> post = SerializableTester.reserializeAndAssert(pre);
    assertEquals(pre.apply("foo"), post.apply("foo"));
  }

  @GwtIncompatible // java.util.regex.Pattern
  public void testContains_equals() {
    new EqualsTester()
        .addEqualityGroup(
            Predicates.contains(Pattern.compile("foo")), Predicates.containsPattern("foo"))