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Java example source code file (WellBehavedMapTest.java)

This example Java source code file (WellBehavedMapTest.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

enummap, foo, gwtcompatible, integer, testcase, util, wellbehavedmap, wellbehavedmaptest

The WellBehavedMapTest.java Java example source code

/*
 * Copyright (C) 2011 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 com.google.common.annotations.GwtCompatible;

import junit.framework.TestCase;

import java.util.EnumMap;
import java.util.Map;
import java.util.Set;

@GwtCompatible
public class WellBehavedMapTest extends TestCase {
  enum Foo {
    X, Y, Z, T
  }

  public void testEntrySet_contain() {
    WellBehavedMap<Foo, Integer> map = WellBehavedMap.wrap(
        new EnumMap<Foo, Integer>(Foo.class));
    map.putAll(ImmutableMap.of(Foo.X, 1, Foo.Y, 2, Foo.Z, 3));

    // testing with the exact entry
    assertTrue(map.entrySet().contains(Maps.immutableEntry(Foo.X, 1)));
    assertTrue(map.entrySet().contains(Maps.immutableEntry(Foo.Y, new Integer(2))));

    // testing an entry with a contained key, but not the same value
    assertFalse(map.entrySet().contains(Maps.immutableEntry(Foo.X, 5)));

    // testing a non-existent key
    assertFalse(map.entrySet().contains(Maps.immutableEntry(Foo.T, 0)));
  }

  public void testEntry_setValue() {
    WellBehavedMap<Foo, Integer> map = WellBehavedMap.wrap(
        new EnumMap<Foo, Integer>(Foo.class));
    map.putAll(ImmutableMap.of(Foo.X, 1, Foo.Y, 2, Foo.Z, 3));

    for (Map.Entry<Foo, Integer> entry : map.entrySet()) {
      entry.setValue(entry.getValue() + 5);
    }

    assertEquals(ImmutableMap.of(Foo.X, 6, Foo.Y, 7, Foo.Z, 8), map);
  }

  public void testEntriesAreMutableAndConsistent() {
    WellBehavedMap<Foo, Integer> map = WellBehavedMap.wrap(
        new EnumMap<Foo, Integer>(Foo.class));
    map.putAll(ImmutableMap.of(Foo.X, 1));

    Map.Entry<Foo, Integer> entry1 = Iterables.getOnlyElement(map.entrySet());
    Map.Entry<Foo, Integer> entry2 = Iterables.getOnlyElement(map.entrySet());

    // the entries are constructed and forgotten, thus different
    assertNotSame(entry1, entry2);

    Set<Map.Entry entrySet = map.entrySet();

    assertTrue(entrySet.contains(entry1));
    assertTrue(entrySet.contains(entry2));

    // mutating entry
    entry1.setValue(2);

    // entry2 is also modified
    assertEquals(entry1.getValue(), entry2.getValue());

    // and both are still contained in the set
    assertTrue(entrySet.contains(entry1));
    assertTrue(entrySet.contains(entry2));
  }

  public void testEntrySet_remove() {
    WellBehavedMap<Foo, Integer> map = WellBehavedMap.wrap(
        new EnumMap<Foo, Integer>(Foo.class));
    map.putAll(ImmutableMap.of(Foo.X, 1, Foo.Y, 2, Foo.Z, 3));
    Set<Map.Entry entrySet = map.entrySet();

    // removing an existing entry, verifying consistency
    Map.Entry<Foo, Integer> entry = Maps.immutableEntry(Foo.Y, 2);
    assertTrue(entrySet.remove(entry));
    assertFalse(map.containsKey(Foo.Y));
    assertNull(map.get(Foo.Y));
    assertFalse(entrySet.contains(entry));

    // we didn't have that entry, not removed
    assertFalse(entrySet.remove(Maps.immutableEntry(Foo.T, 4)));

    // we didn't have that entry, only <Z, 3>, must not remove
    assertFalse(entrySet.remove(Maps.immutableEntry(Foo.Z, 5)));
  }
}

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