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Java example source code file (ArrayListMultimapTest.java)

This example Java source code file (ArrayListMultimapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylistmultimap, arraylistmultimaptest, concurrentmodificationexception, entry, expected, gwtincompatible, illegalargumentexception, integer, multimap, randomaccess, string, testcase, teststringlistmultimapgenerator, testsuite, util

The ArrayListMultimapTest.java Java example source code

/*
 * 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;

import static com.google.common.truth.Truth.assertThat;
import static java.util.Arrays.asList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.collect.testing.google.ListMultimapTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringListMultimapGenerator;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import java.util.ConcurrentModificationException;
import java.util.List;
import java.util.Map.Entry;
import java.util.RandomAccess;

/**
 * Unit tests for {@code ArrayListMultimap}.
 *
 * @author Jared Levy
 */
@GwtCompatible(emulated = true)
public class ArrayListMultimapTest extends TestCase {

  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(ListMultimapTestSuiteBuilder.using(new TestStringListMultimapGenerator() {
        @Override
        protected ListMultimap<String, String> create(Entry[] entries) {
          ListMultimap<String, String> multimap = ArrayListMultimap.create();
          for (Entry<String, String> entry : entries) {
            multimap.put(entry.getKey(), entry.getValue());
          }
          return multimap;
        }
      })
      .named("ArrayListMultimap")
      .withFeatures(
          MapFeature.ALLOWS_NULL_KEYS,
          MapFeature.ALLOWS_NULL_VALUES,
          MapFeature.ALLOWS_ANY_NULL_QUERIES,
          MapFeature.GENERAL_PURPOSE,
          MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION,
          CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
          CollectionFeature.SERIALIZABLE,
          CollectionSize.ANY)
      .createTestSuite());
    suite.addTestSuite(ArrayListMultimapTest.class);
    return suite;
  }

  protected ListMultimap<String, Integer> create() {
    return ArrayListMultimap.create();
  }

  /**
   * Confirm that get() returns a List implementing RandomAccess.
   */
  public void testGetRandomAccess() {
    Multimap<String, Integer> multimap = create();
    multimap.put("foo", 1);
    multimap.put("foo", 3);
    assertTrue(multimap.get("foo") instanceof RandomAccess);
    assertTrue(multimap.get("bar") instanceof RandomAccess);
  }

  /**
   * Confirm that removeAll() returns a List implementing RandomAccess.
   */
  public void testRemoveAllRandomAccess() {
    Multimap<String, Integer> multimap = create();
    multimap.put("foo", 1);
    multimap.put("foo", 3);
    assertTrue(multimap.removeAll("foo") instanceof RandomAccess);
    assertTrue(multimap.removeAll("bar") instanceof RandomAccess);
  }

  /**
   * Confirm that replaceValues() returns a List implementing RandomAccess.
   */
  public void testReplaceValuesRandomAccess() {
    Multimap<String, Integer> multimap = create();
    multimap.put("foo", 1);
    multimap.put("foo", 3);
    assertTrue(multimap.replaceValues("foo", asList(2, 4))
        instanceof RandomAccess);
    assertTrue(multimap.replaceValues("bar", asList(2, 4))
        instanceof RandomAccess);
  }

  /**
   * Test throwing ConcurrentModificationException when a sublist's ancestor's
   * delegate changes.
   */
  public void testSublistConcurrentModificationException() {
    ListMultimap<String, Integer> multimap = create();
    multimap.putAll("foo", asList(1, 2, 3, 4, 5));
    List<Integer> list = multimap.get("foo");
    assertThat(multimap.get("foo")).containsExactly(1, 2, 3, 4, 5).inOrder();
    List<Integer> sublist = list.subList(0, 5);
    assertThat(sublist).containsExactly(1, 2, 3, 4, 5).inOrder();

    sublist.clear();
    assertTrue(sublist.isEmpty());
    multimap.put("foo", 6);

    try {
      sublist.isEmpty();
      fail("Expected ConcurrentModificationException");
    } catch (ConcurrentModificationException expected) {}
  }

  public void testCreateFromMultimap() {
    Multimap<String, Integer> multimap = create();
    multimap.put("foo", 1);
    multimap.put("foo", 3);
    multimap.put("bar", 2);
    ArrayListMultimap<String, Integer> copy
        = ArrayListMultimap.create(multimap);
    assertEquals(multimap, copy);
  }

  public void testCreate() {
    ArrayListMultimap<String, Integer> multimap
        = ArrayListMultimap.create();
    assertEquals(3, multimap.expectedValuesPerKey);
  }

  public void testCreateFromSizes() {
    ArrayListMultimap<String, Integer> multimap
        = ArrayListMultimap.create(15, 20);
    assertEquals(20, multimap.expectedValuesPerKey);
  }

  public void testCreateFromIllegalSizes() {
    try {
      ArrayListMultimap.create(15, -2);
      fail();
    } catch (IllegalArgumentException expected) {}

    try {
      ArrayListMultimap.create(-15, 2);
      fail();
    } catch (IllegalArgumentException expected) {}
  }

  public void testCreateFromHashMultimap() {
    Multimap<String, Integer> original = HashMultimap.create();
    ArrayListMultimap<String, Integer> multimap
        = ArrayListMultimap.create(original);
    assertEquals(3, multimap.expectedValuesPerKey);
  }

  public void testCreateFromArrayListMultimap() {
    ArrayListMultimap<String, Integer> original
        = ArrayListMultimap.create(15, 20);
    ArrayListMultimap<String, Integer> multimap
        = ArrayListMultimap.create(original);
    assertEquals(20, multimap.expectedValuesPerKey);
  }

  public void testTrimToSize() {
    ArrayListMultimap<String, Integer> multimap
        = ArrayListMultimap.create();
    multimap.put("foo", 1);
    multimap.put("foo", 2);
    multimap.put("bar", 3);
    multimap.trimToSize();
    assertEquals(3, multimap.size());
    assertThat(multimap.get("foo")).containsExactly(1, 2).inOrder();
    assertThat(multimap.get("bar")).contains(3);
  }
}

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