}

  public void testNulls_enum() throws Exception {
    tester.testNulls(OneConstantEnum.class);
    tester.testNulls(NoConstantEnum.class);
    tester.testNulls(TimeUnit.class);
  }

  public void testNulls_parameterOptionalNotInstantiable() throws Exception {
    tester.testNulls(ConstructorParameterWithOptionalNotInstantiable.class);
  }

   * </ul>
   *
   * <p>In all cases, if {@code C} needs custom logic for testing nulls, you can add an explicit
   * {@code testNulls()} test in the corresponding {@code CTest} class, and {@code C} will be
   * excluded from the automated null tests performed by this method.
   */
  @Test
  public void testNulls() throws Exception {
    for (Class<?> classToTest : findClassesToTest(loadClassesInPackage(), NULL_TEST_METHOD_NAMES)) {

    assertNotNull(generator.generateFresh(Currency.class));
  }

  public void testNulls() throws Exception {
    new ClassSanityTester()
        .setDefault(Method.class, FreshValueGeneratorTest.class.getDeclaredMethod("testNulls"))
        .testNulls(FreshValueGenerator.class);
  }

  private static void assertFreshInstances(Class<?>... types) {
    for (Class<?> type : types) {

 *
 * <p>And all the created {@code Book} instances can be tested with:
 *
 * <pre>
 * new ClassSanityTester()
 *     .forAllPublicStaticMethods(Books.class)
 *     .thatReturn(Book.class)
 *     .testEquals(); // or testNulls(), testSerializable() etc.
 * </pre>
 *
 * @author Ben Yu
 * @since 14.0
 */
@GwtIncompatible
@J2ktIncompatible
@NullUnmarked
@SuppressWarnings("nullness")
public final class ClassSanityTester {

    checkCanReserialize(Functions.forSupplier(new CountingSupplier()));
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  public void testNulls() throws Exception {
    new ClassSanityTester().forAllPublicStaticMethods(Functions.class).testNulls();
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  @AndroidIncompatible // TODO(cpovirk): ClassNotFoundException: com.google.common.base.Function

 *
 * <p>And all the created {@code Book} instances can be tested with:
 *
 * <pre>
 * new ClassSanityTester()
 *     .forAllPublicStaticMethods(Books.class)
 *     .thatReturn(Book.class)
 *     .testEquals(); // or testNulls(), testSerializable() etc.
 * </pre>
 *
 * @author Ben Yu
 * @since 14.0
 */
@GwtIncompatible
@J2ktIncompatible
@NullUnmarked
@SuppressWarnings("nullness")
public final class ClassSanityTester {

    assertEquals("7f8005ff0e", HashCode.fromBytes(data).toString());
    assertEquals("7f8005ff0e", base16().lowerCase().encode(data));
  }

  public void testHashCode_nulls() throws Exception {
    sanityTester().testNulls();
  }

  public void testHashCode_equalsAndSerializable() throws Exception {
    sanityTester().testEqualsAndSerializable();
  }

  public void testRoundTripHashCodeUsingBaseEncoding() {

    checkCanReserialize(Functions.forSupplier(new CountingSupplier()));
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  public void testNulls() throws Exception {
    new ClassSanityTester().forAllPublicStaticMethods(Functions.class).testNulls();
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  @AndroidIncompatible // TODO(cpovirk): ClassNotFoundException: com.google.common.base.Function

        IllegalArgumentException.class,
        () ->
            new ForwardingWrapperTester()
                .testForwarding(String.class, Functions.<String>identity()));
  }

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

  private <T> void assertFailure(

  public void testSuppliersNullChecks() throws Exception {
    new ClassSanityTester()
        .setDefault(Duration.class, Duration.ofSeconds(1))
        .forAllPublicStaticMethods(Suppliers.class)
        .testNulls();
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  @AndroidIncompatible // TODO(cpovirk): ClassNotFoundException: com.google.common.base.Function