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Guava testlib is a set of java classes used for more convenient unit testing - particularly to assist the tests for Guava itself.

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/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import com.google.common.annotations.GwtIncompatible;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collection;
import java.util.List;

/**
 * Reserializes the sets created by another test set generator.
 *
 * TODO: make CollectionTestSuiteBuilder test reserialized collections
 *
 * @author Jesse Wilson
 */
@GwtIncompatible
public class ReserializingTestCollectionGenerator implements TestCollectionGenerator {
  private final TestCollectionGenerator delegate;

  ReserializingTestCollectionGenerator(TestCollectionGenerator delegate) {
    this.delegate = delegate;
  }

  public static  ReserializingTestCollectionGenerator newInstance(
      TestCollectionGenerator delegate) {
    return new ReserializingTestCollectionGenerator<>(delegate);
  }

  @Override
  public Collection create(Object... elements) {
    return reserialize(delegate.create(elements));
  }

  @SuppressWarnings("unchecked")
  static  T reserialize(T object) {
    try {
      ByteArrayOutputStream bytes = new ByteArrayOutputStream();
      ObjectOutputStream out = new ObjectOutputStream(bytes);
      out.writeObject(object);
      ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray()));
      return (T) in.readObject();
    } catch (IOException | ClassNotFoundException e) {
      throw new AssertionError(e);
    }
  }

  @Override
  public SampleElements samples() {
    return delegate.samples();
  }

  @Override
  public E[] createArray(int length) {
    return delegate.createArray(length);
  }

  @Override
  public Iterable order(List insertionOrder) {
    return delegate.order(insertionOrder);
  }
}