private final ForwardingWrapperTester tester = new ForwardingWrapperTester();

  public void testGoodForwarder() {
    tester.testForwarding(Arithmetic.class, ForwardingArithmetic::new);
    tester.testForwarding(ParameterTypesDifferent.class, ParameterTypesDifferentForwarder::new);
  }

  public void testVoidMethodForwarding() {
    tester.testForwarding(Runnable.class, ForwardingRunnable::new);
  }

  private final ForwardingWrapperTester tester = new ForwardingWrapperTester();

  public void testGoodForwarder() {
    tester.testForwarding(Arithmetic.class, ForwardingArithmetic::new);
    tester.testForwarding(ParameterTypesDifferent.class, ParameterTypesDifferentForwarder::new);
  }

  public void testVoidMethodForwarding() {
    tester.testForwarding(Runnable.class, ForwardingRunnable::new);
  }

      return new Class<?>[length];
    }

    @Override
    public Impl[] createValueArray(int length) {
      return new Impl[length];
    }

    @Override
    public SampleElements<Entry<Class<?>, Impl>> samples() {
      return new SampleElements<>(
          immutableEntry(One.class, new Impl(1)),
          immutableEntry(Two.class, new Impl(2)),

        return getStdoutLines(new String[] {"git", "diff", "--name-only", commit + "^1.." + commit});
    }

    private static List<String> branchesOf(String commit) throws IOException, InterruptedException, ExecutionException {
        List<String> lines = getStdoutLines(new String[] {"git", "branch", "-r", "--contains", commit});
        List<String> out = new ArrayList<>();
        for (String line : lines) {

     */
    map.put(Integer.class, new Integer(5));
    assertThrows(ClassCastException.class, () -> map.put(Double.class, new Long(42)));
    // Won't compile: map.put(String.class, "x");
  }

  public void testPutAndGetInstance() {
    assertThat(map.putInstance(Integer.class, new Integer(5))).isNull();

    Integer oldValue = map.putInstance(Integer.class, new Integer(7));
    assertEquals(5, (int) oldValue);

      Supplier<Spliterator<E>> spliteratorSupplier) {
    return new SpliteratorTester<>(
        ImmutableSet.of(() -> new GeneralSpliteratorOfObject<>(spliteratorSupplier.get())));
  }

  /**
   * @since 33.4.0 (but since 28.1 in the JRE flavor)
   */
  public static SpliteratorTester<Integer> ofInt(Supplier<Spliterator.OfInt> spliteratorSupplier) {
    return new SpliteratorTester<>(
        ImmutableSet.of(

            () -> new GeneralSpliteratorOfPrimitive<>(spliteratorSupplier.get(), c -> c::accept)));
  }

  /**
   * @since 28.1 (but only since 33.4.0 in the Android flavor)
   */
  public static SpliteratorTester<Long> ofLong(Supplier<Spliterator.OfLong> spliteratorSupplier) {
    return new SpliteratorTester<>(
        ImmutableSet.of(

    private DummyInternalEntry() {
      throw new AssertionError();
    }

    @Override
    public DummyInternalEntry getNext() {
      throw new AssertionError();
    }

    @Override
    public int getHash() {
      throw new AssertionError();
    }

    @Override
    public Object getKey() {
      throw new AssertionError();
    }

    @Override

    List<ParameterNotInstantiableException> paramErrors = new ArrayList<>();
    List<ParameterHasNoDistinctValueException> distinctValueErrors = new ArrayList<>();
    List<InvocationTargetException> instantiationExceptions = new ArrayList<>();
    List<FactoryMethodReturnsNullException> nullErrors = new ArrayList<>();
    // Try factories with the greatest number of parameters.

    }
    return delegate instanceof Serializable
        ? new MemoizingSupplier<T>(delegate)
        : new NonSerializableMemoizingSupplier<T>(delegate);
  }

  @VisibleForTesting
  static final class MemoizingSupplier<T extends @Nullable Object>
      implements Supplier<T>, Serializable {
    private transient Object lock = new Object();

    final Supplier<T> delegate;