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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.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.Feature;
import com.google.common.collect.testing.testers.CollectionSerializationEqualTester;
import com.google.common.collect.testing.testers.SetAddAllTester;
import com.google.common.collect.testing.testers.SetAddTester;
import com.google.common.collect.testing.testers.SetCreationTester;
import com.google.common.collect.testing.testers.SetEqualsTester;
import com.google.common.collect.testing.testers.SetHashCodeTester;
import com.google.common.collect.testing.testers.SetRemoveTester;
import com.google.common.testing.SerializableTester;

import junit.framework.TestSuite;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests
 * a Set implementation.
 *
 * @author George van den Driessche
 */
public class SetTestSuiteBuilder
    extends AbstractCollectionTestSuiteBuilder, E> {
  public static  SetTestSuiteBuilder using(
      TestSetGenerator generator) {
    return new SetTestSuiteBuilder().usingGenerator(generator);
  }

  @Override protected List> getTesters() {
    List> testers
        = Helpers.copyToList(super.getTesters());
    
    testers.add(CollectionSerializationEqualTester.class);
    testers.add(SetAddAllTester.class);
    testers.add(SetAddTester.class);
    testers.add(SetCreationTester.class);
    testers.add(SetHashCodeTester.class);
    testers.add(SetEqualsTester.class);
    testers.add(SetRemoveTester.class);
    // SetRemoveAllTester doesn't exist because, Sets not permitting
    // duplicate elements, there are no tests for Set.removeAll() that aren't
    // covered by CollectionRemoveAllTester.
    return testers;
  }

  @Override
  protected
      List
      createDerivedSuites(
          FeatureSpecificTestSuiteBuilder<
              ?, ? extends OneSizeTestContainerGenerator, E>> parentBuilder) {
    List derivedSuites = new ArrayList(
        super.createDerivedSuites(parentBuilder));

    if (parentBuilder.getFeatures().contains(CollectionFeature.SERIALIZABLE)) {
      derivedSuites.add(SetTestSuiteBuilder
          .using(new ReserializedSetGenerator(parentBuilder.getSubjectGenerator()))
          .named(getName() + " reserialized")
          .withFeatures(computeReserializedCollectionFeatures(parentBuilder.getFeatures()))
          .suppressing(parentBuilder.getSuppressedTests())
          .createTestSuite());
    }
    return derivedSuites;
  }
  
  static class ReserializedSetGenerator implements TestSetGenerator{
    final OneSizeTestContainerGenerator, E> gen;

    private ReserializedSetGenerator(OneSizeTestContainerGenerator, E> gen) {
      this.gen = gen;
    }

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

    @Override
    public Set create(Object... elements) {
      return (Set) SerializableTester.reserialize(gen.create(elements));
    }

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

    @Override
    public Iterable order(List insertionOrder) {
      return gen.order(insertionOrder);
    }
  }
  
  private static Set> computeReserializedCollectionFeatures(
      Set> features) {
    Set> derivedFeatures = new HashSet>();
    derivedFeatures.addAll(features);
    derivedFeatures.remove(CollectionFeature.SERIALIZABLE);
    derivedFeatures.remove(CollectionFeature.SERIALIZABLE_INCLUDING_VIEWS);
    return derivedFeatures;
  }
}