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| 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 // TODO(nweiz): Get rid of this when https://codereview.chromium.org/1241723003/ | |
| 6 // lands. | |
| 7 | |
| 8 import 'dart:async'; | |
| 9 | |
| 10 import 'package:test/test.dart'; | |
| 11 import 'package:test/src/util/forkable_stream.dart'; | |
| 12 import 'package:test/src/util/stream_queue.dart'; | |
| 13 | |
| 14 void main() { | |
| 15 var controller; | |
| 16 var stream; | |
| 17 setUp(() { | |
| 18 var cancelFuture = new Future.value(42); | |
| 19 controller = new StreamController<int>(onCancel: () => cancelFuture); | |
| 20 stream = new ForkableStream<int>(controller.stream); | |
| 21 }); | |
| 22 | |
| 23 group("with no forks", () { | |
| 24 test("forwards events, errors, and close", () async { | |
| 25 var queue = new StreamQueue(stream); | |
| 26 | |
| 27 controller.add(1); | |
| 28 expect(await queue.next, equals(1)); | |
| 29 | |
| 30 controller.add(2); | |
| 31 expect(await queue.next, equals(2)); | |
| 32 | |
| 33 controller.addError("error"); | |
| 34 expect(queue.next, throwsA("error")); | |
| 35 await flushMicrotasks(); | |
| 36 | |
| 37 controller.add(3); | |
| 38 expect(await queue.next, equals(3)); | |
| 39 | |
| 40 controller.close(); | |
| 41 expect(await queue.hasNext, isFalse); | |
| 42 }); | |
| 43 | |
| 44 test("listens to, pauses, and cancels the controller", () { | |
| 45 expect(controller.hasListener, isFalse); | |
| 46 | |
| 47 var sub = stream.listen(null); | |
| 48 expect(controller.hasListener, isTrue); | |
| 49 | |
| 50 sub.pause(); | |
| 51 expect(controller.isPaused, isTrue); | |
| 52 | |
| 53 sub.resume(); | |
| 54 expect(controller.isPaused, isFalse); | |
| 55 | |
| 56 sub.cancel(); | |
| 57 expect(controller.hasListener, isFalse); | |
| 58 }); | |
| 59 | |
| 60 test("unpauses the controller when a fork is listened", () { | |
| 61 stream.listen(null).pause(); | |
| 62 expect(controller.isPaused, isTrue); | |
| 63 | |
| 64 var fork = stream.fork(); | |
| 65 expect(controller.isPaused, isTrue); | |
| 66 | |
| 67 fork.listen(null); | |
| 68 expect(controller.isPaused, isFalse); | |
| 69 }); | |
| 70 }); | |
| 71 | |
| 72 group("with a fork created before the stream was listened", () { | |
| 73 var fork; | |
| 74 setUp(() { | |
| 75 fork = stream.fork(); | |
| 76 }); | |
| 77 | |
| 78 test("forwards events, errors, and close to both branches", () async { | |
| 79 var queue = new StreamQueue(stream); | |
| 80 var forkQueue = new StreamQueue(fork); | |
| 81 | |
| 82 controller.add(1); | |
| 83 expect(await queue.next, equals(1)); | |
| 84 expect(await forkQueue.next, equals(1)); | |
| 85 | |
| 86 controller.add(2); | |
| 87 expect(await queue.next, equals(2)); | |
| 88 expect(await forkQueue.next, equals(2)); | |
| 89 | |
| 90 controller.addError("error"); | |
| 91 expect(queue.next, throwsA("error")); | |
| 92 expect(forkQueue.next, throwsA("error")); | |
| 93 await flushMicrotasks(); | |
| 94 | |
| 95 controller.add(3); | |
| 96 expect(await queue.next, equals(3)); | |
| 97 expect(await forkQueue.next, equals(3)); | |
| 98 | |
| 99 controller.close(); | |
| 100 expect(await queue.hasNext, isFalse); | |
| 101 expect(await forkQueue.hasNext, isFalse); | |
| 102 }); | |
| 103 | |
| 104 test('listens to the source when the original is listened', () { | |
| 105 expect(controller.hasListener, isFalse); | |
| 106 stream.listen(null); | |
| 107 expect(controller.hasListener, isTrue); | |
| 108 }); | |
| 109 | |
| 110 test('listens to the source when the fork is listened', () { | |
| 111 expect(controller.hasListener, isFalse); | |
| 112 fork.listen(null); | |
| 113 expect(controller.hasListener, isTrue); | |
| 114 }); | |
| 115 }); | |
| 116 | |
| 117 test("with a fork created after the stream emitted a few events, forwards " | |
| 118 "future events, errors, and close to both branches", () async { | |
| 119 var queue = new StreamQueue(stream); | |
| 120 | |
| 121 controller.add(1); | |
| 122 expect(await queue.next, equals(1)); | |
| 123 | |
| 124 controller.add(2); | |
| 125 expect(await queue.next, equals(2)); | |
| 126 | |
| 127 var fork = stream.fork(); | |
| 128 var forkQueue = new StreamQueue(fork); | |
| 129 | |
| 130 controller.add(3); | |
| 131 expect(await queue.next, equals(3)); | |
| 132 expect(await forkQueue.next, equals(3)); | |
| 133 | |
| 134 controller.addError("error"); | |
| 135 expect(queue.next, throwsA("error")); | |
| 136 expect(forkQueue.next, throwsA("error")); | |
| 137 await flushMicrotasks(); | |
| 138 | |
| 139 controller.close(); | |
| 140 expect(await queue.hasNext, isFalse); | |
| 141 expect(await forkQueue.hasNext, isFalse); | |
| 142 }); | |
| 143 | |
| 144 group("with multiple forks", () { | |
| 145 var fork1; | |
| 146 var fork2; | |
| 147 var fork3; | |
| 148 var fork4; | |
| 149 setUp(() { | |
| 150 fork1 = stream.fork(); | |
| 151 fork2 = stream.fork(); | |
| 152 fork3 = stream.fork(); | |
| 153 fork4 = stream.fork(); | |
| 154 }); | |
| 155 | |
| 156 test("forwards events, errors, and close to all branches", () async { | |
| 157 var queue1 = new StreamQueue(stream); | |
| 158 var queue2 = new StreamQueue(fork1); | |
| 159 var queue3 = new StreamQueue(fork2); | |
| 160 var queue4 = new StreamQueue(fork3); | |
| 161 var queue5 = new StreamQueue(fork4); | |
| 162 | |
| 163 controller.add(1); | |
| 164 expect(await queue1.next, equals(1)); | |
| 165 expect(await queue2.next, equals(1)); | |
| 166 expect(await queue3.next, equals(1)); | |
| 167 expect(await queue4.next, equals(1)); | |
| 168 expect(await queue5.next, equals(1)); | |
| 169 | |
| 170 controller.add(2); | |
| 171 expect(await queue1.next, equals(2)); | |
| 172 expect(await queue2.next, equals(2)); | |
| 173 expect(await queue3.next, equals(2)); | |
| 174 expect(await queue4.next, equals(2)); | |
| 175 expect(await queue5.next, equals(2)); | |
| 176 | |
| 177 controller.addError("error"); | |
| 178 expect(queue1.next, throwsA("error")); | |
| 179 expect(queue2.next, throwsA("error")); | |
| 180 expect(queue3.next, throwsA("error")); | |
| 181 expect(queue4.next, throwsA("error")); | |
| 182 expect(queue5.next, throwsA("error")); | |
| 183 await flushMicrotasks(); | |
| 184 | |
| 185 controller.add(3); | |
| 186 expect(await queue1.next, equals(3)); | |
| 187 expect(await queue2.next, equals(3)); | |
| 188 expect(await queue3.next, equals(3)); | |
| 189 expect(await queue4.next, equals(3)); | |
| 190 expect(await queue5.next, equals(3)); | |
| 191 | |
| 192 controller.close(); | |
| 193 expect(await queue1.hasNext, isFalse); | |
| 194 expect(await queue2.hasNext, isFalse); | |
| 195 expect(await queue3.hasNext, isFalse); | |
| 196 expect(await queue4.hasNext, isFalse); | |
| 197 expect(await queue5.hasNext, isFalse); | |
| 198 }); | |
| 199 | |
| 200 test("forwards events in order of forking", () async { | |
| 201 var queue1 = new StreamQueue(stream); | |
| 202 var queue2 = new StreamQueue(fork1); | |
| 203 var queue3 = new StreamQueue(fork2); | |
| 204 var queue4 = new StreamQueue(fork3); | |
| 205 var queue5 = new StreamQueue(fork4); | |
| 206 | |
| 207 for (var i = 0; i < 4; i++) { | |
| 208 controller.add(i); | |
| 209 | |
| 210 var queue1Fired = false; | |
| 211 var queue2Fired = false; | |
| 212 var queue3Fired = false; | |
| 213 var queue4Fired = false; | |
| 214 var queue5Fired = false; | |
| 215 | |
| 216 queue5.next.then(expectAsync((_) { | |
| 217 queue5Fired = true; | |
| 218 expect(queue1Fired, isTrue); | |
| 219 expect(queue2Fired, isTrue); | |
| 220 expect(queue3Fired, isTrue); | |
| 221 expect(queue4Fired, isTrue); | |
| 222 })); | |
| 223 | |
| 224 queue1.next.then(expectAsync((_) { | |
| 225 queue1Fired = true; | |
| 226 expect(queue2Fired, isFalse); | |
| 227 expect(queue3Fired, isFalse); | |
| 228 expect(queue4Fired, isFalse); | |
| 229 expect(queue5Fired, isFalse); | |
| 230 })); | |
| 231 | |
| 232 queue4.next.then(expectAsync((_) { | |
| 233 queue4Fired = true; | |
| 234 expect(queue1Fired, isTrue); | |
| 235 expect(queue2Fired, isTrue); | |
| 236 expect(queue3Fired, isTrue); | |
| 237 expect(queue5Fired, isFalse); | |
| 238 })); | |
| 239 | |
| 240 queue2.next.then(expectAsync((_) { | |
| 241 queue2Fired = true; | |
| 242 expect(queue1Fired, isTrue); | |
| 243 expect(queue3Fired, isFalse); | |
| 244 expect(queue4Fired, isFalse); | |
| 245 expect(queue5Fired, isFalse); | |
| 246 })); | |
| 247 | |
| 248 queue3.next.then(expectAsync((_) { | |
| 249 queue3Fired = true; | |
| 250 expect(queue1Fired, isTrue); | |
| 251 expect(queue2Fired, isTrue); | |
| 252 expect(queue4Fired, isFalse); | |
| 253 expect(queue5Fired, isFalse); | |
| 254 })); | |
| 255 } | |
| 256 }); | |
| 257 | |
| 258 test("pauses the source when all forks are paused and/or not listening", | |
| 259 () { | |
| 260 var sub1 = stream.listen(null); | |
| 261 var sub2 = fork1.listen(null); | |
| 262 expect(controller.isPaused, isFalse); | |
| 263 | |
| 264 sub1.pause(); | |
| 265 expect(controller.isPaused, isFalse); | |
| 266 | |
| 267 sub2.pause(); | |
| 268 expect(controller.isPaused, isTrue); | |
| 269 | |
| 270 var sub3 = fork2.listen(null); | |
| 271 expect(controller.isPaused, isFalse); | |
| 272 | |
| 273 sub3.pause(); | |
| 274 expect(controller.isPaused, isTrue); | |
| 275 | |
| 276 sub2.resume(); | |
| 277 expect(controller.isPaused, isFalse); | |
| 278 | |
| 279 sub2.cancel(); | |
| 280 expect(controller.isPaused, isTrue); | |
| 281 }); | |
| 282 | |
| 283 test("cancels the source when all forks are canceled", () async { | |
| 284 var sub1 = stream.listen(null); | |
| 285 expect(controller.hasListener, isTrue); | |
| 286 | |
| 287 var sub2 = fork1.listen(null); | |
| 288 expect(controller.hasListener, isTrue); | |
| 289 | |
| 290 expect(sub1.cancel(), isNull); | |
| 291 await flushMicrotasks(); | |
| 292 expect(controller.hasListener, isTrue); | |
| 293 | |
| 294 expect(sub2.cancel(), isNull); | |
| 295 await flushMicrotasks(); | |
| 296 expect(controller.hasListener, isTrue); | |
| 297 | |
| 298 expect(fork2.listen(null).cancel(), isNull); | |
| 299 await flushMicrotasks(); | |
| 300 expect(controller.hasListener, isTrue); | |
| 301 | |
| 302 expect(fork3.listen(null).cancel(), isNull); | |
| 303 await flushMicrotasks(); | |
| 304 expect(controller.hasListener, isTrue); | |
| 305 | |
| 306 expect(fork4.listen(null).cancel(), completion(equals(42))); | |
| 307 await flushMicrotasks(); | |
| 308 expect(controller.hasListener, isFalse); | |
| 309 }); | |
| 310 }); | |
| 311 | |
| 312 group("modification during dispatch:", () { | |
| 313 test("forking during onCancel", () { | |
| 314 controller = new StreamController<int>(onCancel: expectAsync(() { | |
| 315 expect(stream.fork().toList(), completion(isEmpty)); | |
| 316 })); | |
| 317 stream = new ForkableStream<int>(controller.stream); | |
| 318 | |
| 319 stream.listen(null).cancel(); | |
| 320 }); | |
| 321 | |
| 322 test("forking during onPause", () { | |
| 323 controller = new StreamController<int>(onPause: expectAsync(() { | |
| 324 stream.fork().listen(null); | |
| 325 })); | |
| 326 stream = new ForkableStream<int>(controller.stream); | |
| 327 | |
| 328 stream.listen(null).pause(); | |
| 329 | |
| 330 // The fork created in onPause should have resumed the stream. | |
| 331 expect(controller.isPaused, isFalse); | |
| 332 }); | |
| 333 | |
| 334 test("forking during onData", () { | |
| 335 var sub; | |
| 336 sub = stream.listen(expectAsync((value1) { | |
| 337 expect(value1, equals(1)); | |
| 338 stream.fork().listen(expectAsync((value2) { | |
| 339 expect(value2, equals(2)); | |
| 340 })); | |
| 341 sub.cancel(); | |
| 342 })); | |
| 343 | |
| 344 controller.add(1); | |
| 345 controller.add(2); | |
| 346 }); | |
| 347 | |
| 348 test("canceling a fork during onData", () { | |
| 349 var fork = stream.fork(); | |
| 350 var forkSub = fork.listen(expectAsync((_) {}, count: 0)); | |
| 351 | |
| 352 stream.listen(expectAsync((_) => forkSub.cancel())); | |
| 353 controller.add(null); | |
| 354 }); | |
| 355 | |
| 356 test("forking during onError", () { | |
| 357 var sub; | |
| 358 sub = stream.listen(null, onError: expectAsync((error1) { | |
| 359 expect(error1, equals("error 1")); | |
| 360 stream.fork().listen(null, onError: expectAsync((error2) { | |
| 361 expect(error2, equals("error 2")); | |
| 362 })); | |
| 363 sub.cancel(); | |
| 364 })); | |
| 365 | |
| 366 controller.addError("error 1"); | |
| 367 controller.addError("error 2"); | |
| 368 }); | |
| 369 | |
| 370 test("canceling a fork during onError", () { | |
| 371 var fork = stream.fork(); | |
| 372 var forkSub = fork.listen(expectAsync((_) {}, count: 0)); | |
| 373 | |
| 374 stream.listen(null, onError: expectAsync((_) => forkSub.cancel())); | |
| 375 controller.addError("error"); | |
| 376 }); | |
| 377 | |
| 378 test("forking during onDone", () { | |
| 379 stream.listen(null, onDone: expectAsync(() { | |
| 380 expect(stream.fork().toList(), completion(isEmpty)); | |
| 381 })); | |
| 382 | |
| 383 controller.close(); | |
| 384 }); | |
| 385 | |
| 386 test("canceling a fork during onDone", () { | |
| 387 var fork = stream.fork(); | |
| 388 var forkSub = fork.listen(null, onDone: expectAsync(() {}, count: 0)); | |
| 389 | |
| 390 stream.listen(null, onDone: expectAsync(() => forkSub.cancel())); | |
| 391 controller.close(); | |
| 392 }); | |
| 393 }); | |
| 394 | |
| 395 group("throws an error when", () { | |
| 396 test("a cancelled stream is forked", () { | |
| 397 stream.listen(null).cancel(); | |
| 398 expect(stream.fork().toList(), completion(isEmpty)); | |
| 399 }); | |
| 400 | |
| 401 test("a cancelled stream is forked even when other forks are alive", () { | |
| 402 stream.fork().listen(null); | |
| 403 stream.listen(null).cancel(); | |
| 404 | |
| 405 expect(controller.hasListener, isTrue); | |
| 406 expect(stream.fork().toList(), completion(isEmpty)); | |
| 407 }); | |
| 408 | |
| 409 test("a closed stream is forked", () async { | |
| 410 controller.close(); | |
| 411 await stream.listen(null).asFuture(); | |
| 412 expect(stream.fork().toList(), completion(isEmpty)); | |
| 413 }); | |
| 414 }); | |
| 415 } | |
| 416 | |
| 417 Future flushMicrotasks() => new Future.delayed(Duration.ZERO); | |
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Chromium Code Reviews
Issue 2379083002:
Delete tests of features in pkg/async (Closed)
