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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) 2007 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.GwtCompatible;
import com.google.common.collect.testing.SampleElements.Ints;

import java.util.List;
import java.util.Set;

/**
 * Create integer sets for collection tests.
 *
 * @author Gregory Kick
 */
@GwtCompatible
public abstract class TestIntegerSetGenerator implements TestSetGenerator {
  @Override public SampleElements samples() {
    return new Ints();
  }

  @Override public Set create(Object... elements) {
    Integer[] array = new Integer[elements.length];
    int i = 0;
    for (Object e : elements) {
      array[i++] = (Integer) e;
    }
    return create(array);
  }

  protected abstract Set create(Integer[] elements);

  @Override public Integer[] createArray(int length) {
    return new Integer[length];
  }

  /**
   * {@inheritDoc}
   *
   * By default, returns the supplied elements in their given order; however,
   * generators for containers with a known order other than insertion order
   * must override this method.
   *
   * Note: This default implementation is overkill (but valid) for an
   * unordered container. An equally valid implementation for an unordered
   * container is to throw an exception. The chosen implementation, however, has
   * the advantage of working for insertion-ordered containers, as well.
   */
  @Override public List order(List insertionOrder) {
    return insertionOrder;
  }
}