NullPointerTester npTester = new NullPointerTester();
    npTester.testAllPublicConstructors(Optional.class);
    npTester.testAllPublicStaticMethods(Optional.class);
    npTester.testAllPublicInstanceMethods(Optional.absent());
    npTester.testAllPublicInstanceMethods(Optional.of("training"));
  }

    }
    fail();
  }

  public void testInterfaceDefaultMethod() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(InterfaceDefaultMethodChecksNull.create());
    try {
      tester.testAllPublicInstanceMethods(InterfaceDefaultMethodFailsToCheckNull.create());
    } catch (AssertionError expected) {
      return;
    }
    fail();
  }

    tester.testAllPublicStaticMethods(ImmutableListMultimap.class);
    tester.ignore(ImmutableListMultimap.class.getMethod("get", Object.class));
    tester.testAllPublicInstanceMethods(ImmutableListMultimap.of());
    tester.testAllPublicInstanceMethods(ImmutableListMultimap.of("a", 1));
  }

    NullPointerTester tester =
        new NullPointerTester().setDefault(String.class, "HmacMD5").setDefault(Key.class, MD5_KEY);
    tester.testAllPublicConstructors(MacHashFunction.class);
    tester.testAllPublicInstanceMethods(new MacHashFunction("HmacMD5", MD5_KEY, "toString"));
  }

  public void testHashing() throws Exception {
    for (String stringToTest : INPUTS) {

    tester.testAllPublicInstanceMethods(isWooString);
  }

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester
  public void testContains_nulls() throws Exception {
    NullPointerTester tester = new NullPointerTester();
    Predicate<CharSequence> isWooPattern = Predicates.contains(Pattern.compile("Woo"));

    tester.testAllPublicInstanceMethods(isWooPattern);
  }

                .testForwarding(String.class, Functions.<String>identity()));
  }

  public void testNulls() {
    new NullPointerTester()
        .setDefault(Class.class, Runnable.class)
        .testAllPublicInstanceMethods(new ForwardingWrapperTester());
  }

  private <T> void assertFailure(
      Class<T> interfaceType,
      Function<T, ? extends T> wrapperFunction,
      String... expectedMessages) {
    try {

    tester.testAllPublicStaticMethods(ImmutableMap.class);
    tester.testAllPublicInstanceMethods(new ImmutableMap.Builder<Object, Object>());
    tester.testAllPublicInstanceMethods(ImmutableMap.of());
    tester.testAllPublicInstanceMethods(ImmutableMap.of("one", 1));
    tester.testAllPublicInstanceMethods(ImmutableMap.of("one", 1, "two", 2, "three", 3));
  }

  // null parameters test

  public void testNullParameters() throws Exception {
    NullPointerTester tester = new NullPointerTester();
    CacheLoader<Object, Object> loader = identityLoader();
    tester.testAllPublicInstanceMethods(makeCache(createCacheBuilder(), loader));
  }

  // stats tests

  public void testStats() {
    CacheBuilder<Object, Object> builder = createCacheBuilder().concurrencyLevel(1).maximumSize(2);

                .testForwarding(String.class, Functions.<String>identity()));
  }

  public void testNulls() {
    new NullPointerTester()
        .setDefault(Class.class, Runnable.class)
        .testAllPublicInstanceMethods(new ForwardingWrapperTester());
  }

  private <T> void assertFailure(
      Class<T> interfaceType,
      Function<T, ? extends T> wrapperFunction,
      String... expectedMessages) {
    try {

    tester.testAllPublicStaticMethods(ImmutableListMultimap.class);
    tester.ignore(ImmutableListMultimap.class.getMethod("get", Object.class));
    tester.testAllPublicInstanceMethods(ImmutableListMultimap.of());
    tester.testAllPublicInstanceMethods(ImmutableListMultimap.of("a", 1));
  }