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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.GwtCompatible;

import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * A container class for the five sample elements we need for testing.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
public class SampleElements implements Iterable {
  // TODO: rename e3, e4 => missing1, missing2
  public final E e0;
  public final E e1;
  public final E e2;
  public final E e3;
  public final E e4;

  public SampleElements(E e0, E e1, E e2, E e3, E e4) {
    this.e0 = e0;
    this.e1 = e1;
    this.e2 = e2;
    this.e3 = e3;
    this.e4 = e4;
  }

  @Override
  public Iterator iterator() {
    return asList().iterator();
  }
  
  public List asList() {
    return Arrays.asList(e0, e1, e2, e3, e4);
  }

  public static class Strings extends SampleElements {
    public Strings() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super("b", "a", "c", "d", "e");
    }

    // for testing SortedSet and SortedMap methods
    public static final String BEFORE_FIRST = "\0";
    public static final String BEFORE_FIRST_2 = "\0\0";
    public static final String MIN_ELEMENT = "a";
    public static final String AFTER_LAST = "z";
    public static final String AFTER_LAST_2 = "zz";
  }

  public static class Chars extends SampleElements {
    public Chars() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super('b', 'a', 'c', 'd', 'e');
    }
  }

  public static class Enums extends SampleElements {
    public Enums() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super(AnEnum.B, AnEnum.A, AnEnum.C, AnEnum.D, AnEnum.E);
    }
  }

  public static class Ints extends SampleElements {
    public Ints() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super(1, 0, 2, 3, 4);
    }
  }

  public static  SampleElements> mapEntries(
      SampleElements keys, SampleElements values) {
    return new SampleElements>(
        Helpers.mapEntry(keys.e0, values.e0),
        Helpers.mapEntry(keys.e1, values.e1),
        Helpers.mapEntry(keys.e2, values.e2),
        Helpers.mapEntry(keys.e3, values.e3),
        Helpers.mapEntry(keys.e4, values.e4));
  }

  public static class Unhashables extends SampleElements {
    public Unhashables() {
      super(new UnhashableObject(1),
          new UnhashableObject(2),
          new UnhashableObject(3),
          new UnhashableObject(4),
          new UnhashableObject(5));
    }
  }

  public static class Colliders extends SampleElements