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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) 2012 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.google;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.BiMap;
import com.google.common.collect.testing.AbstractMapTester;
import com.google.common.collect.testing.Helpers;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map.Entry;

/**
 * Skeleton for a tester of a {@code BiMap}.
 */
@GwtCompatible
public abstract class AbstractBiMapTester extends AbstractMapTester {

  @Override
  protected BiMap getMap() {
    return (BiMap) super.getMap();
  }

  static  Entry reverseEntry(Entry entry) {
    return Helpers.mapEntry(entry.getValue(), entry.getKey());
  }

  @Override
  protected void expectContents(Collection> expected) {
    super.expectContents(expected);
    List> reversedEntries = new ArrayList>();
    for (Entry entry : expected) {
      reversedEntries.add(reverseEntry(entry));
    }
    Helpers.assertEqualIgnoringOrder(getMap().inverse().entrySet(), reversedEntries);

    for (Entry entry : expected) {
      assertEquals("Wrong key for value " + entry.getValue(), entry.getKey(), getMap()
          .inverse()
          .get(entry.getValue()));
    }
  }

  @Override
  protected void expectMissing(Entry... entries) {
    super.expectMissing(entries);
    for (Entry entry : entries) {
      Entry reversed = reverseEntry(entry);
      BiMap inv = getMap().inverse();
      assertFalse("Inverse should not contain entry " + reversed,
          inv.entrySet().contains(entry));
      assertFalse("Inverse should not contain key " + entry.getValue(),
          inv.containsKey(entry.getValue()));
      assertFalse("Inverse should not contain value " + entry.getKey(),
          inv.containsValue(entry.getKey()));
      assertNull("Inverse should not return a mapping for key " + entry.getValue(),
          getMap().get(entry.getValue()));
    }
  }

}