| /* |
| * 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; |
| |
| import com.google.common.annotations.GwtCompatible; |
| |
| import junit.framework.TestCase; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Unit tests for {@link Sets#union}, {@link Sets#intersection} and |
| * {@link Sets#difference}. |
| * |
| * @author Kevin Bourrillion |
| */ |
| @GwtCompatible(emulated = true) |
| public class SetOperationsTest extends TestCase { |
| |
| public static class MoreTests extends TestCase { |
| Set<String> friends; |
| Set<String> enemies; |
| |
| @Override public void setUp() { |
| friends = Sets.newHashSet("Tom", "Joe", "Dave"); |
| enemies = Sets.newHashSet("Dick", "Harry", "Tom"); |
| } |
| |
| public void testUnion() { |
| Set<String> all = Sets.union(friends, enemies); |
| assertEquals(5, all.size()); |
| |
| ImmutableSet<String> immut = Sets.union(friends, enemies).immutableCopy(); |
| HashSet<String> mut |
| = Sets.union(friends, enemies).copyInto(new HashSet<String>()); |
| |
| enemies.add("Buck"); |
| assertEquals(6, all.size()); |
| assertEquals(5, immut.size()); |
| assertEquals(5, mut.size()); |
| } |
| |
| public void testIntersection() { |
| Set<String> friends = Sets.newHashSet("Tom", "Joe", "Dave"); |
| Set<String> enemies = Sets.newHashSet("Dick", "Harry", "Tom"); |
| |
| Set<String> frenemies = Sets.intersection(friends, enemies); |
| assertEquals(1, frenemies.size()); |
| |
| ImmutableSet<String> immut |
| = Sets.intersection(friends, enemies).immutableCopy(); |
| HashSet<String> mut |
| = Sets.intersection(friends, enemies).copyInto(new HashSet<String>()); |
| |
| enemies.add("Joe"); |
| assertEquals(2, frenemies.size()); |
| assertEquals(1, immut.size()); |
| assertEquals(1, mut.size()); |
| } |
| |
| public void testDifference() { |
| Set<String> friends = Sets.newHashSet("Tom", "Joe", "Dave"); |
| Set<String> enemies = Sets.newHashSet("Dick", "Harry", "Tom"); |
| |
| Set<String> goodFriends = Sets.difference(friends, enemies); |
| assertEquals(2, goodFriends.size()); |
| |
| ImmutableSet<String> immut |
| = Sets.difference(friends, enemies).immutableCopy(); |
| HashSet<String> mut |
| = Sets.difference(friends, enemies).copyInto(new HashSet<String>()); |
| |
| enemies.add("Dave"); |
| assertEquals(1, goodFriends.size()); |
| assertEquals(2, immut.size()); |
| assertEquals(2, mut.size()); |
| } |
| |
| public void testSymmetricDifference() { |
| Set<String> friends = Sets.newHashSet("Tom", "Joe", "Dave"); |
| Set<String> enemies = Sets.newHashSet("Dick", "Harry", "Tom"); |
| |
| Set<String> symmetricDifferenceFriendsFirst = Sets.symmetricDifference( |
| friends, enemies); |
| assertEquals(4, symmetricDifferenceFriendsFirst.size()); |
| |
| Set<String> symmetricDifferenceEnemiesFirst = Sets.symmetricDifference( |
| enemies, friends); |
| assertEquals(4, symmetricDifferenceEnemiesFirst.size()); |
| |
| assertEquals(symmetricDifferenceFriendsFirst, |
| symmetricDifferenceEnemiesFirst); |
| |
| ImmutableSet<String> immut |
| = Sets.symmetricDifference(friends, enemies).immutableCopy(); |
| HashSet<String> mut = Sets.symmetricDifference(friends, enemies) |
| .copyInto(new HashSet<String>()); |
| |
| enemies.add("Dave"); |
| assertEquals(3, symmetricDifferenceFriendsFirst.size()); |
| assertEquals(4, immut.size()); |
| assertEquals(4, mut.size()); |
| |
| immut = Sets.symmetricDifference(enemies, friends).immutableCopy(); |
| mut = Sets.symmetricDifference(enemies, friends). |
| copyInto(new HashSet<String>()); |
| friends.add("Harry"); |
| assertEquals(2, symmetricDifferenceEnemiesFirst.size()); |
| assertEquals(3, immut.size()); |
| assertEquals(3, mut.size()); |
| } |
| } |
| } |
| |