HashSetTest.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad 
1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18package tests.api.java.util;
19
20import java.util.Arrays;
21import java.util.HashSet;
22import java.util.Iterator;
23import java.util.Set;
24import java.io.ObjectOutputStream;
25import java.io.ByteArrayOutputStream;
26import java.io.IOException;
27import java.io.Serializable;
28import java.lang.reflect.Method;
29import java.lang.reflect.InvocationTargetException;
30
31import org.apache.harmony.testframework.serialization.SerializationTest;
32
33public class HashSetTest extends junit.framework.TestCase {
34
35    HashSet hs;
36
37    static Object[] objArray;
38    {
39        objArray = new Object[1000];
40        for (int i = 0; i < objArray.length; i++)
41            objArray[i] = new Integer(i);
42    }
43
44    /**
45     * @tests java.util.HashSet#HashSet()
46     */
47    public void test_Constructor() {
48        // Test for method java.util.HashSet()
49        HashSet hs2 = new HashSet();
50        assertEquals("Created incorrect HashSet", 0, hs2.size());
51    }
52
53    /**
54     * @tests java.util.HashSet#HashSet(int)
55     */
56    public void test_ConstructorI() {
57        // Test for method java.util.HashSet(int)
58        HashSet hs2 = new HashSet(5);
59        assertEquals("Created incorrect HashSet", 0, hs2.size());
60        try {
61            new HashSet(-1);
62        } catch (IllegalArgumentException e) {
63            return;
64        }
65        fail(
66                "Failed to throw IllegalArgumentException for capacity < 0");
67    }
68
69    /**
70     * @tests java.util.HashSet#HashSet(int, float)
71     */
72    public void test_ConstructorIF() {
73        // Test for method java.util.HashSet(int, float)
74        HashSet hs2 = new HashSet(5, (float) 0.5);
75        assertEquals("Created incorrect HashSet", 0, hs2.size());
76        try {
77            new HashSet(0, 0);
78        } catch (IllegalArgumentException e) {
79            return;
80        }
81        fail(
82                "Failed to throw IllegalArgumentException for initial load factor <= 0");
83    }
84
85    /**
86     * @tests java.util.HashSet#HashSet(java.util.Collection)
87     */
88    public void test_ConstructorLjava_util_Collection() {
89        // Test for method java.util.HashSet(java.util.Collection)
90        HashSet hs2 = new HashSet(Arrays.asList(objArray));
91        for (int counter = 0; counter < objArray.length; counter++)
92            assertTrue("HashSet does not contain correct elements", hs
93                    .contains(objArray[counter]));
94        assertTrue("HashSet created from collection incorrect size",
95                hs2.size() == objArray.length);
96    }
97
98    /**
99     * @tests java.util.HashSet#add(java.lang.Object)
100     */
101    public void test_addLjava_lang_Object() {
102        // Test for method boolean java.util.HashSet.add(java.lang.Object)
103        int size = hs.size();
104        hs.add(new Integer(8));
105        assertTrue("Added element already contained by set", hs.size() == size);
106        hs.add(new Integer(-9));
107        assertTrue("Failed to increment set size after add",
108                hs.size() == size + 1);
109        assertTrue("Failed to add element to set", hs.contains(new Integer(-9)));
110    }
111
112    /**
113     * @tests java.util.HashSet#clear()
114     */
115    public void test_clear() {
116        // Test for method void java.util.HashSet.clear()
117        Set orgSet = (Set) hs.clone();
118        hs.clear();
119        Iterator i = orgSet.iterator();
120        assertEquals("Returned non-zero size after clear", 0, hs.size());
121        while (i.hasNext())
122            assertTrue("Failed to clear set", !hs.contains(i.next()));
123    }
124
125    /**
126     * @tests java.util.HashSet#clone()
127     */
128    public void test_clone() {
129        // Test for method java.lang.Object java.util.HashSet.clone()
130        HashSet hs2 = (HashSet) hs.clone();
131        assertTrue("clone returned an equivalent HashSet", hs != hs2);
132        assertTrue("clone did not return an equal HashSet", hs.equals(hs2));
133    }
134
135    /**
136     * @tests java.util.HashSet#contains(java.lang.Object)
137     */
138    public void test_containsLjava_lang_Object() {
139        // Test for method boolean java.util.HashSet.contains(java.lang.Object)
140        assertTrue("Returned false for valid object", hs.contains(objArray[90]));
141        assertTrue("Returned true for invalid Object", !hs
142                .contains(new Object()));
143
144        HashSet s = new HashSet();
145        s.add(null);
146        assertTrue("Cannot handle null", s.contains(null));
147    }
148
149    /**
150     * @tests java.util.HashSet#isEmpty()
151     */
152    public void test_isEmpty() {
153        // Test for method boolean java.util.HashSet.isEmpty()
154        assertTrue("Empty set returned false", new HashSet().isEmpty());
155        assertTrue("Non-empty set returned true", !hs.isEmpty());
156    }
157
158    /**
159     * @tests java.util.HashSet#iterator()
160     */
161    public void test_iterator() {
162        // Test for method java.util.Iterator java.util.HashSet.iterator()
163        Iterator i = hs.iterator();
164        int x = 0;
165        while (i.hasNext()) {
166            assertTrue("Failed to iterate over all elements", hs.contains(i
167                    .next()));
168            ++x;
169        }
170        assertTrue("Returned iteration of incorrect size", hs.size() == x);
171
172        HashSet s = new HashSet();
173        s.add(null);
174        assertNull("Cannot handle null", s.iterator().next());
175    }
176
177    /**
178     * @tests java.util.HashSet#remove(java.lang.Object)
179     */
180    public void test_removeLjava_lang_Object() {
181        // Test for method boolean java.util.HashSet.remove(java.lang.Object)
182        int size = hs.size();
183        hs.remove(new Integer(98));
184        assertTrue("Failed to remove element", !hs.contains(new Integer(98)));
185        assertTrue("Failed to decrement set size", hs.size() == size - 1);
186
187        HashSet s = new HashSet();
188        s.add(null);
189        assertTrue("Cannot handle null", s.remove(null));
190    }
191
192    /**
193     * @tests java.util.HashSet#size()
194     */
195    public void test_size() {
196        // Test for method int java.util.HashSet.size()
197        assertTrue("Returned incorrect size", hs.size() == (objArray.length + 1));
198        hs.clear();
199        assertEquals("Cleared set returned non-zero size", 0, hs.size());
200    }
201
202    /**
203     * @tests java.util.HashSet#SerializationTest
204     */
205    public void test_Serialization() throws Exception{
206        HashSet<String> hs = new HashSet<String>();
207        hs.add("hello");
208        hs.add("world");
209        SerializationTest.verifySelf(hs, comparator);
210        SerializationTest.verifyGolden(this, hs, comparator);
211    }
212
213    /**
214     * Sets up the fixture, for example, open a network connection. This method
215     * is called before a test is executed.
216     */
217    protected void setUp() {
218        hs = new HashSet();
219        for (int i = 0; i < objArray.length; i++)
220            hs.add(objArray[i]);
221        hs.add(null);
222    }
223
224    /**
225     * Tears down the fixture, for example, close a network connection. This
226     * method is called after a test is executed.
227     */
228    protected void tearDown() {
229    }
230
231    private static final SerializationTest.SerializableAssert comparator = new
232                                       SerializationTest.SerializableAssert() {
233        public void assertDeserialized(Serializable initial, Serializable deserialized) {
234            HashSet<String> initialHs = (HashSet<String>) initial;
235            HashSet<String> deseriaHs = (HashSet<String>) deserialized;
236            assertEquals("should be equal", initialHs.size(), deseriaHs.size());
237            assertEquals("should be equal", initialHs, deseriaHs);
238        }
239
240    };
241}
242