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1 package org.tigris.scarab.util;
2
3
48
49 import junit.framework.TestCase;
50
51 import java.util.ArrayList  ;
52 import java.util.Collection ;
53 import java.util.NoSuchElementException ;
54
55
60 public class SubsetIteratorTest extends TestCase
61 {
62 protected SubsetIterator subsetIterator;
63 protected SubsetIterator subsetIteratorUntilLast;
64
65 protected static final String FIRST = "first element";
66 protected static final String SECOND = "second element";
67 protected static final String THIRD = "third element";
68 protected static final String FOURTH = "fourth element";
69 protected static final String LAST = "last element";
70
71 public SubsetIteratorTest(String testName)
72 {
73 super(testName);
74 }
75
76 public void setUp()
77 {
78 Collection coll = new ArrayList ();
79
80 coll.add(FIRST);
81 coll.add(SECOND);
82 coll.add(THIRD);
83 coll.add(FOURTH);
84 coll.add(LAST);
85
86 subsetIterator = new SubsetIterator(coll.iterator(), 2, 2);
88
89 subsetIteratorUntilLast = new SubsetIterator(coll.iterator(), 2);
91 }
92
93 public void tearDown()
94 {
95 subsetIterator = null;
96 }
97
98 public void testConstructor()
99 {
100 assertEquals("Could not fetch third element", subsetIterator.next(), THIRD);
101
102 assertTrue("Filled collection should have next element", subsetIterator.hasNext());
103
104 subsetIterator.remove(); assertEquals("Could not fetch fourth element", subsetIterator.next(), FOURTH);
106 assertFalse("SubsetIterator on last position should not have next element", subsetIterator.hasNext());
107 }
108
109 public void testConstructorWithoutElements()
110 {
111 assertEquals("Could not fetch third element", subsetIteratorUntilLast.next(), THIRD);
112
113 assertTrue("Filled collection should have next element", subsetIteratorUntilLast.hasNext());
114
115 subsetIteratorUntilLast.remove(); assertEquals("Could not fetch fourth element", subsetIteratorUntilLast.next(), FOURTH);
117 assertEquals("Could not fetch last element", subsetIteratorUntilLast.next(), LAST);
118 assertFalse("SubsetIterator on last position should not have next element", subsetIteratorUntilLast.hasNext());
119 }
120
121 public void testConstructorWithEmptyCollection()
122 {
123 Collection coll = new ArrayList ();
124 SubsetIterator i = new SubsetIterator(coll.iterator(), 0, 0);
125
126 assertFalse("Empty collection should not have next element", i.hasNext());
127
128 try {
129 i.next();
130 fail("Empty collection should raise an exception on next()");
131 } catch (NoSuchElementException e) {
132 } catch (Exception e) {
134 fail("Empty collection should raise NoSuchElementException on next() and not " + e.getClass().getName());
135 }
136
137 try {
138 i.remove();
139 fail("Empty collection should raise an exception on remove()");
140 } catch (IllegalStateException e) {
141 } catch (Exception e) {
143 fail("Empty collection should raise IllegalStateException on remove() and not " + e.getClass().getName());
144 }
145 }
146
147 public void testConstructorWithBiggerSubsetThanTheOriginal()
148 {
149 Collection coll = new ArrayList ();
150
151 coll.add(FIRST);
152 coll.add(SECOND);
153 coll.add(THIRD);
154 coll.add(FOURTH);
155 coll.add(LAST);
156
157 subsetIterator = new SubsetIterator(coll.iterator(), 2, 100);
159
160 assertEquals("Could not fetch third element", subsetIterator.next(), THIRD);
161
162 assertTrue("Filled collection should have next element", subsetIterator.hasNext());
163 assertEquals("Could not fetch fourth element", subsetIterator.next(), FOURTH);
164 assertEquals("Could not fetch last element", subsetIterator.next(), LAST);
165 assertFalse("SubsetIterator on last position should not have next element", subsetIterator.hasNext());
166 }
167
168 public void testHasNext()
169 {
170 assertTrue("Before first element hasNext() should be true", subsetIterator.hasNext());
171 subsetIterator.next();
172 assertTrue("On first element hasNext() should be true", subsetIterator.hasNext());
173 subsetIterator.next();
174 assertFalse("On last element hasNext() should be false", subsetIterator.hasNext());
175 }
176
177 public void testNext()
178 {
179 assertEquals("Could not fetch third element", subsetIterator.next(), THIRD);
180 assertEquals("Could not fetch fourth element", subsetIterator.next(), FOURTH);
181 try
182 {
183 subsetIterator.next();
184 fail("next() on last element should raise an exception");
185 } catch (NoSuchElementException e) {
186 } catch (Exception e) {
188 fail("next() on last element should raise NoSuchElementException and not " +
189 e.getClass().getName());
190 }
191 }
192
193 public void testRemove()
194 {
195 try
196 {
197 subsetIterator.remove();
198 fail("remove() before first element should raise an exception");
199 } catch (IllegalStateException e) {
200 } catch (Exception e) {
202 fail("remove() before first element should raise IllegalStateException and not " +
203 e.getClass().getName());
204 }
205
206 subsetIterator.next();
207 subsetIterator.remove();
208 assertTrue("Before first element hasNext() should be true", subsetIterator.hasNext());
209 subsetIterator.next();
210 assertFalse("On last element hasNext() should be false", subsetIterator.hasNext());
211 subsetIterator.remove();
212 }
213
214 }
215 |
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