Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 | * Expert Group and released to the public domain, as explained at |
| 4 | * http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 | * Other contributors include Andrew Wright, Jeffrey Hayes, |
| 6 | * Pat Fisher, Mike Judd. |
| 7 | */ |
| 8 | |
| 9 | package jsr166; |
| 10 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 11 | import java.util.ArrayList; |
| 12 | import java.util.Arrays; |
| 13 | import java.util.Collection; |
| 14 | import java.util.Collections; |
| 15 | import java.util.Iterator; |
| 16 | import java.util.NoSuchElementException; |
| 17 | import java.util.Set; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 18 | import java.util.concurrent.CopyOnWriteArraySet; |
| 19 | |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 20 | import junit.framework.Test; |
| 21 | import junit.framework.TestSuite; |
| 22 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 23 | public class CopyOnWriteArraySetTest extends JSR166TestCase { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 24 | // android-note: Removed because the CTS runner does a bad job of |
| 25 | // retrying tests that have suite() declarations. |
| 26 | // |
| 27 | // public static void main(String[] args) { |
| 28 | // main(suite(), args); |
| 29 | // } |
| 30 | // public static Test suite() { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 31 | // return new TestSuite(CopyOnWriteArraySetTest.class); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 32 | // } |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 33 | |
| 34 | static CopyOnWriteArraySet<Integer> populatedSet(int n) { |
| 35 | CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>(); |
| 36 | assertTrue(a.isEmpty()); |
| 37 | for (int i = 0; i < n; i++) |
| 38 | a.add(i); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 39 | assertEquals(n == 0, a.isEmpty()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 40 | assertEquals(n, a.size()); |
| 41 | return a; |
| 42 | } |
| 43 | |
| 44 | static CopyOnWriteArraySet populatedSet(Integer[] elements) { |
| 45 | CopyOnWriteArraySet<Integer> a = new CopyOnWriteArraySet<Integer>(); |
| 46 | assertTrue(a.isEmpty()); |
| 47 | for (int i = 0; i < elements.length; i++) |
| 48 | a.add(elements[i]); |
| 49 | assertFalse(a.isEmpty()); |
| 50 | assertEquals(elements.length, a.size()); |
| 51 | return a; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Default-constructed set is empty |
| 56 | */ |
| 57 | public void testConstructor() { |
| 58 | CopyOnWriteArraySet a = new CopyOnWriteArraySet(); |
| 59 | assertTrue(a.isEmpty()); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Collection-constructed set holds all of its elements |
| 64 | */ |
| 65 | public void testConstructor3() { |
| 66 | Integer[] ints = new Integer[SIZE]; |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 67 | for (int i = 0; i < SIZE - 1; ++i) |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 68 | ints[i] = new Integer(i); |
| 69 | CopyOnWriteArraySet a = new CopyOnWriteArraySet(Arrays.asList(ints)); |
| 70 | for (int i = 0; i < SIZE; ++i) |
| 71 | assertTrue(a.contains(ints[i])); |
| 72 | } |
| 73 | |
| 74 | /** |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 75 | * addAll adds each non-duplicate element from the given collection |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 76 | */ |
| 77 | public void testAddAll() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 78 | Set full = populatedSet(3); |
| 79 | assertTrue(full.addAll(Arrays.asList(three, four, five))); |
| 80 | assertEquals(6, full.size()); |
| 81 | assertFalse(full.addAll(Arrays.asList(three, four, five))); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 82 | assertEquals(6, full.size()); |
| 83 | } |
| 84 | |
| 85 | /** |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 86 | * addAll adds each non-duplicate element from the given collection |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 87 | */ |
| 88 | public void testAddAll2() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 89 | Set full = populatedSet(3); |
| 90 | // "one" is duplicate and will not be added |
| 91 | assertTrue(full.addAll(Arrays.asList(three, four, one))); |
| 92 | assertEquals(5, full.size()); |
| 93 | assertFalse(full.addAll(Arrays.asList(three, four, one))); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 94 | assertEquals(5, full.size()); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * add will not add the element if it already exists in the set |
| 99 | */ |
| 100 | public void testAdd2() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 101 | Set full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 102 | full.add(one); |
| 103 | assertEquals(3, full.size()); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * add adds the element when it does not exist in the set |
| 108 | */ |
| 109 | public void testAdd3() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 110 | Set full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 111 | full.add(three); |
| 112 | assertTrue(full.contains(three)); |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * clear removes all elements from the set |
| 117 | */ |
| 118 | public void testClear() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 119 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 120 | full.clear(); |
| 121 | assertEquals(0, full.size()); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 122 | assertTrue(full.isEmpty()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | /** |
| 126 | * contains returns true for added elements |
| 127 | */ |
| 128 | public void testContains() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 129 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 130 | assertTrue(full.contains(one)); |
| 131 | assertFalse(full.contains(five)); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Sets with equal elements are equal |
| 136 | */ |
| 137 | public void testEquals() { |
| 138 | CopyOnWriteArraySet a = populatedSet(3); |
| 139 | CopyOnWriteArraySet b = populatedSet(3); |
| 140 | assertTrue(a.equals(b)); |
| 141 | assertTrue(b.equals(a)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 142 | assertTrue(a.containsAll(b)); |
| 143 | assertTrue(b.containsAll(a)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 144 | assertEquals(a.hashCode(), b.hashCode()); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 145 | assertEquals(a.size(), b.size()); |
| 146 | |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 147 | a.add(m1); |
| 148 | assertFalse(a.equals(b)); |
| 149 | assertFalse(b.equals(a)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 150 | assertTrue(a.containsAll(b)); |
| 151 | assertFalse(b.containsAll(a)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 152 | b.add(m1); |
| 153 | assertTrue(a.equals(b)); |
| 154 | assertTrue(b.equals(a)); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 155 | assertTrue(a.containsAll(b)); |
| 156 | assertTrue(b.containsAll(a)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 157 | assertEquals(a.hashCode(), b.hashCode()); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 158 | |
| 159 | Object x = a.iterator().next(); |
| 160 | a.remove(x); |
| 161 | assertFalse(a.equals(b)); |
| 162 | assertFalse(b.equals(a)); |
| 163 | assertFalse(a.containsAll(b)); |
| 164 | assertTrue(b.containsAll(a)); |
| 165 | a.add(x); |
| 166 | assertTrue(a.equals(b)); |
| 167 | assertTrue(b.equals(a)); |
| 168 | assertTrue(a.containsAll(b)); |
| 169 | assertTrue(b.containsAll(a)); |
| 170 | assertEquals(a.hashCode(), b.hashCode()); |
| 171 | assertEquals(a.size(), b.size()); |
| 172 | |
| 173 | CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList()); |
| 174 | CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList()); |
| 175 | assertTrue(empty1.equals(empty1)); |
| 176 | assertTrue(empty1.equals(empty2)); |
| 177 | |
| 178 | assertFalse(empty1.equals(a)); |
| 179 | assertFalse(a.equals(empty1)); |
| 180 | |
| 181 | assertFalse(a.equals(null)); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | /** |
| 185 | * containsAll returns true for collections with subset of elements |
| 186 | */ |
| 187 | public void testContainsAll() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 188 | Collection full = populatedSet(3); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 189 | assertTrue(full.containsAll(full)); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 190 | assertTrue(full.containsAll(Arrays.asList())); |
| 191 | assertTrue(full.containsAll(Arrays.asList(one))); |
| 192 | assertTrue(full.containsAll(Arrays.asList(one, two))); |
| 193 | assertFalse(full.containsAll(Arrays.asList(one, two, six))); |
| 194 | assertFalse(full.containsAll(Arrays.asList(six))); |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 195 | |
| 196 | CopyOnWriteArraySet empty1 = new CopyOnWriteArraySet(Arrays.asList()); |
| 197 | CopyOnWriteArraySet empty2 = new CopyOnWriteArraySet(Arrays.asList()); |
| 198 | assertTrue(empty1.containsAll(empty2)); |
| 199 | assertTrue(empty1.containsAll(empty1)); |
| 200 | assertFalse(empty1.containsAll(full)); |
| 201 | assertTrue(full.containsAll(empty1)); |
| 202 | |
| 203 | try { |
| 204 | full.containsAll(null); |
| 205 | shouldThrow(); |
| 206 | } catch (NullPointerException success) {} |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | /** |
| 210 | * isEmpty is true when empty, else false |
| 211 | */ |
| 212 | public void testIsEmpty() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 213 | assertTrue(populatedSet(0).isEmpty()); |
| 214 | assertFalse(populatedSet(3).isEmpty()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /** |
| 218 | * iterator() returns an iterator containing the elements of the |
| 219 | * set in insertion order |
| 220 | */ |
| 221 | public void testIterator() { |
| 222 | Collection empty = new CopyOnWriteArraySet(); |
| 223 | assertFalse(empty.iterator().hasNext()); |
| 224 | try { |
| 225 | empty.iterator().next(); |
| 226 | shouldThrow(); |
| 227 | } catch (NoSuchElementException success) {} |
| 228 | |
| 229 | Integer[] elements = new Integer[SIZE]; |
| 230 | for (int i = 0; i < SIZE; i++) |
| 231 | elements[i] = i; |
| 232 | Collections.shuffle(Arrays.asList(elements)); |
| 233 | Collection<Integer> full = populatedSet(elements); |
| 234 | |
| 235 | Iterator it = full.iterator(); |
| 236 | for (int j = 0; j < SIZE; j++) { |
| 237 | assertTrue(it.hasNext()); |
| 238 | assertEquals(elements[j], it.next()); |
| 239 | } |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 240 | assertIteratorExhausted(it); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * iterator of empty collection has no elements |
| 245 | */ |
| 246 | public void testEmptyIterator() { |
| 247 | assertIteratorExhausted(new CopyOnWriteArraySet().iterator()); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | /** |
| 251 | * iterator remove is unsupported |
| 252 | */ |
| 253 | public void testIteratorRemove() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 254 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 255 | Iterator it = full.iterator(); |
| 256 | it.next(); |
| 257 | try { |
| 258 | it.remove(); |
| 259 | shouldThrow(); |
| 260 | } catch (UnsupportedOperationException success) {} |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * toString holds toString of elements |
| 265 | */ |
| 266 | public void testToString() { |
| 267 | assertEquals("[]", new CopyOnWriteArraySet().toString()); |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 268 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 269 | String s = full.toString(); |
| 270 | for (int i = 0; i < 3; ++i) |
| 271 | assertTrue(s.contains(String.valueOf(i))); |
| 272 | assertEquals(new ArrayList(full).toString(), |
| 273 | full.toString()); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * removeAll removes all elements from the given collection |
| 278 | */ |
| 279 | public void testRemoveAll() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 280 | Set full = populatedSet(3); |
| 281 | assertTrue(full.removeAll(Arrays.asList(one, two))); |
| 282 | assertEquals(1, full.size()); |
| 283 | assertFalse(full.removeAll(Arrays.asList(one, two))); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 284 | assertEquals(1, full.size()); |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * remove removes an element |
| 289 | */ |
| 290 | public void testRemove() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 291 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 292 | full.remove(one); |
| 293 | assertFalse(full.contains(one)); |
| 294 | assertEquals(2, full.size()); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * size returns the number of elements |
| 299 | */ |
| 300 | public void testSize() { |
Narayan Kamath | 8e9a0e9 | 2015-04-28 11:40:00 +0100 | [diff] [blame] | 301 | Collection empty = new CopyOnWriteArraySet(); |
| 302 | Collection full = populatedSet(3); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 303 | assertEquals(3, full.size()); |
| 304 | assertEquals(0, empty.size()); |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * toArray() returns an Object array containing all elements from |
| 309 | * the set in insertion order |
| 310 | */ |
| 311 | public void testToArray() { |
| 312 | Object[] a = new CopyOnWriteArraySet().toArray(); |
| 313 | assertTrue(Arrays.equals(new Object[0], a)); |
| 314 | assertSame(Object[].class, a.getClass()); |
| 315 | |
| 316 | Integer[] elements = new Integer[SIZE]; |
| 317 | for (int i = 0; i < SIZE; i++) |
| 318 | elements[i] = i; |
| 319 | Collections.shuffle(Arrays.asList(elements)); |
| 320 | Collection<Integer> full = populatedSet(elements); |
| 321 | |
| 322 | assertTrue(Arrays.equals(elements, full.toArray())); |
| 323 | assertSame(Object[].class, full.toArray().getClass()); |
| 324 | } |
| 325 | |
| 326 | /** |
| 327 | * toArray(Integer array) returns an Integer array containing all |
| 328 | * elements from the set in insertion order |
| 329 | */ |
| 330 | public void testToArray2() { |
| 331 | Collection empty = new CopyOnWriteArraySet(); |
| 332 | Integer[] a; |
| 333 | |
| 334 | a = new Integer[0]; |
| 335 | assertSame(a, empty.toArray(a)); |
| 336 | |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 337 | a = new Integer[SIZE / 2]; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 338 | Arrays.fill(a, 42); |
| 339 | assertSame(a, empty.toArray(a)); |
| 340 | assertNull(a[0]); |
| 341 | for (int i = 1; i < a.length; i++) |
| 342 | assertEquals(42, (int) a[i]); |
| 343 | |
| 344 | Integer[] elements = new Integer[SIZE]; |
| 345 | for (int i = 0; i < SIZE; i++) |
| 346 | elements[i] = i; |
| 347 | Collections.shuffle(Arrays.asList(elements)); |
| 348 | Collection<Integer> full = populatedSet(elements); |
| 349 | |
| 350 | Arrays.fill(a, 42); |
| 351 | assertTrue(Arrays.equals(elements, full.toArray(a))); |
| 352 | for (int i = 0; i < a.length; i++) |
| 353 | assertEquals(42, (int) a[i]); |
| 354 | assertSame(Integer[].class, full.toArray(a).getClass()); |
| 355 | |
| 356 | a = new Integer[SIZE]; |
| 357 | Arrays.fill(a, 42); |
| 358 | assertSame(a, full.toArray(a)); |
| 359 | assertTrue(Arrays.equals(elements, a)); |
| 360 | |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 361 | a = new Integer[2 * SIZE]; |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 362 | Arrays.fill(a, 42); |
| 363 | assertSame(a, full.toArray(a)); |
| 364 | assertTrue(Arrays.equals(elements, Arrays.copyOf(a, SIZE))); |
| 365 | assertNull(a[SIZE]); |
| 366 | for (int i = SIZE + 1; i < a.length; i++) |
| 367 | assertEquals(42, (int) a[i]); |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * toArray throws an ArrayStoreException when the given array can |
| 372 | * not store the objects inside the set |
| 373 | */ |
| 374 | public void testToArray_ArrayStoreException() { |
Przemyslaw Szczepaniak | b8b7511 | 2016-03-11 15:59:10 +0000 | [diff] [blame] | 375 | CopyOnWriteArraySet c = new CopyOnWriteArraySet(); |
| 376 | c.add("zfasdfsdf"); |
| 377 | c.add("asdadasd"); |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 378 | try { |
Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 379 | c.toArray(new Long[5]); |
| 380 | shouldThrow(); |
| 381 | } catch (ArrayStoreException success) {} |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * A deserialized serialized set is equal |
| 386 | */ |
| 387 | public void testSerialization() throws Exception { |
| 388 | Set x = populatedSet(SIZE); |
| 389 | Set y = serialClone(x); |
| 390 | |
| 391 | assertNotSame(y, x); |
| 392 | assertEquals(x.size(), y.size()); |
| 393 | assertEquals(x.toString(), y.toString()); |
| 394 | assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
| 395 | assertEquals(x, y); |
| 396 | assertEquals(y, x); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * addAll is idempotent |
| 401 | */ |
| 402 | public void testAddAll_idempotent() throws Exception { |
| 403 | Set x = populatedSet(SIZE); |
| 404 | Set y = new CopyOnWriteArraySet(x); |
| 405 | y.addAll(x); |
| 406 | assertEquals(x, y); |
| 407 | assertEquals(y, x); |
| 408 | } |
| 409 | |
| 410 | } |