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packages/quiver/test/testing/async/fake_async_test.dart

Index: packages/quiver/test/testing/async/fake_async_test.dart
diff --git a/packages/quiver/test/testing/async/fake_async_test.dart b/packages/quiver/test/testing/async/fake_async_test.dart
new file mode 100644
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+++ b/packages/quiver/test/testing/async/fake_async_test.dart
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+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// 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.
+
+library quiver.testing.async.fake_async_test;
+
+import 'dart:async';
+
+import 'package:quiver/testing/async.dart';
+import 'package:test/test.dart';
+
+main() {
+  group('FakeAsync', () {
+    var initialTime = new DateTime(2000);
+    var elapseBy = const Duration(days: 1);
+
+    test('should set initial time', () {
+      expect(new FakeAsync().getClock(initialTime).now(), initialTime);
+    });
+
+    group('elapseBlocking', () {
+      test('should elapse time without calling timers', () {
+        var timerCalled = false;
+        var timer = new Timer(elapseBy ~/ 2, () => timerCalled = true);
+        new FakeAsync().elapseBlocking(elapseBy);
+        expect(timerCalled, isFalse);
+        timer.cancel();
+      });
+
+      test('should elapse time by the specified amount', () {
+        var it = new FakeAsync();
+        it.elapseBlocking(elapseBy);
+        expect(it.getClock(initialTime).now(), initialTime.add(elapseBy));
+      });
+
+      test('should throw when called with a negative duration', () {
+        expect(() {
+          new FakeAsync().elapseBlocking(const Duration(days: -1));
+        }, throwsA(new isInstanceOf<ArgumentError>()));
+      });
+    });
+
+    group('elapse', () {
+      test('should elapse time by the specified amount', () {
+        new FakeAsync().run((async) {
+          async.elapse(elapseBy);
+          expect(async.getClock(initialTime).now(), initialTime.add(elapseBy));
+        });
+      });
+
+      test('should throw ArgumentError when called with a negative duration',
+          () {
+        expect(() => new FakeAsync().elapse(const Duration(days: -1)),
+            throwsA(new isInstanceOf<ArgumentError>()));
+      });
+
+      test('should throw when called before previous call is complete', () {
+        new FakeAsync().run((async) {
+          var error;
+          new Timer(elapseBy ~/ 2, () {
+            try {
+              async.elapse(elapseBy);
+            } catch (e) {
+              error = e;
+            }
+          });
+          async.elapse(elapseBy);
+          expect(error, new isInstanceOf<StateError>());
+        });
+      });
+
+      group('when creating timers', () {
+        test('should call timers expiring before or at end time', () {
+          new FakeAsync().run((async) {
+            var beforeCallCount = 0;
+            var atCallCount = 0;
+            new Timer(elapseBy ~/ 2, () {
+              beforeCallCount++;
+            });
+            new Timer(elapseBy, () {
+              atCallCount++;
+            });
+            async.elapse(elapseBy);
+            expect(beforeCallCount, 1);
+            expect(atCallCount, 1);
+          });
+        });
+
+        test('should call timers expiring due to elapseBlocking', () {
+          new FakeAsync().run((async) {
+            bool secondaryCalled = false;
+            new Timer(elapseBy, () {
+              async.elapseBlocking(elapseBy);
+            });
+            new Timer(elapseBy * 2, () {
+              secondaryCalled = true;
+            });
+            async.elapse(elapseBy);
+            expect(secondaryCalled, isTrue);
+            expect(async.getClock(initialTime).now(),
+                initialTime.add(elapseBy * 2));
+          });
+        });
+
+        test('should call timers at their scheduled time', () {
+          new FakeAsync().run((async) {
+            DateTime calledAt;
+            var periodicCalledAt = <DateTime>[];
+            new Timer(elapseBy ~/ 2, () {
+              calledAt = async.getClock(initialTime).now();
+            });
+            new Timer.periodic(elapseBy ~/ 2, (_) {
+              periodicCalledAt.add(async.getClock(initialTime).now());
+            });
+            async.elapse(elapseBy);
+            expect(calledAt, initialTime.add(elapseBy ~/ 2));
+            expect(periodicCalledAt,
+                [elapseBy ~/ 2, elapseBy].map(initialTime.add));
+          });
+        });
+
+        test('should not call timers expiring after end time', () {
+          new FakeAsync().run((async) {
+            var timerCallCount = 0;
+            new Timer(elapseBy * 2, () {
+              timerCallCount++;
+            });
+            async.elapse(elapseBy);
+            expect(timerCallCount, 0);
+          });
+        });
+
+        test('should not call canceled timers', () {
+          new FakeAsync().run((async) {
+            int timerCallCount = 0;
+            var timer = new Timer(elapseBy ~/ 2, () {
+              timerCallCount++;
+            });
+            timer.cancel();
+            async.elapse(elapseBy);
+            expect(timerCallCount, 0);
+          });
+        });
+
+        test('should call periodic timers each time the duration elapses', () {
+          new FakeAsync().run((async) {
+            var periodicCallCount = 0;
+            new Timer.periodic(elapseBy ~/ 10, (_) {
+              periodicCallCount++;
+            });
+            async.elapse(elapseBy);
+            expect(periodicCallCount, 10);
+          });
+        });
+
+        test('should process microtasks surrounding each timer', () {
+          new FakeAsync().run((async) {
+            var microtaskCalls = 0;
+            var timerCalls = 0;
+            scheduleMicrotasks() {
+              for (int i = 0; i < 5; i++) {
+                scheduleMicrotask(() => microtaskCalls++);
+              }
+            }
+            scheduleMicrotasks();
+            new Timer.periodic(elapseBy ~/ 5, (_) {
+              timerCalls++;
+              expect(microtaskCalls, 5 * timerCalls);
+              scheduleMicrotasks();
+            });
+            async.elapse(elapseBy);
+            expect(timerCalls, 5);
+            expect(microtaskCalls, 5 * (timerCalls + 1));
+          });
+        });
+
+        test('should pass the periodic timer itself to callbacks', () {
+          new FakeAsync().run((async) {
+            Timer passedTimer;
+            Timer periodic = new Timer.periodic(elapseBy, (timer) {
+              passedTimer = timer;
+            });
+            async.elapse(elapseBy);
+            expect(periodic, same(passedTimer));
+          });
+        });
+
+        test('should call microtasks before advancing time', () {
+          new FakeAsync().run((async) {
+            DateTime calledAt;
+            scheduleMicrotask(() {
+              calledAt = async.getClock(initialTime).now();
+            });
+            async.elapse(const Duration(minutes: 1));
+            expect(calledAt, initialTime);
+          });
+        });
+
+        test('should add event before advancing time', () {
+          return new Future(() => new FakeAsync().run((async) {
+            var controller = new StreamController();
+            var ret = controller.stream.first.then((_) {
+              expect(async.getClock(initialTime).now(), initialTime);
+            });
+            controller.add(null);
+            async.elapse(const Duration(minutes: 1));
+            return ret;
+          }));
+        });
+
+        test('should increase negative duration timers to zero duration', () {
+          new FakeAsync().run((async) {
+            var negativeDuration = const Duration(days: -1);
+            DateTime calledAt;
+            new Timer(negativeDuration, () {
+              calledAt = async.getClock(initialTime).now();
+            });
+            async.elapse(const Duration(minutes: 1));
+            expect(calledAt, initialTime);
+          });
+        });
+
+        test('should not be additive with elapseBlocking', () {
+          new FakeAsync().run((async) {
+            new Timer(Duration.ZERO, () => async.elapseBlocking(elapseBy * 5));
+            async.elapse(elapseBy);
+            expect(async.getClock(initialTime).now(),
+                initialTime.add(elapseBy * 5));
+          });
+        });
+
+        group('isActive', () {
+          test('should be false after timer is run', () {
+            new FakeAsync().run((async) {
+              var timer = new Timer(elapseBy ~/ 2, () {});
+              async.elapse(elapseBy);
+              expect(timer.isActive, isFalse);
+            });
+          });
+
+          test('should be true after periodic timer is run', () {
+            new FakeAsync().run((async) {
+              var timer = new Timer.periodic(elapseBy ~/ 2, (_) {});
+              async.elapse(elapseBy);
+              expect(timer.isActive, isTrue);
+            });
+          });
+
+          test('should be false after timer is canceled', () {
+            new FakeAsync().run((async) {
+              var timer = new Timer(elapseBy ~/ 2, () {});
+              timer.cancel();
+              expect(timer.isActive, isFalse);
+            });
+          });
+        });
+
+        test('should work with new Future()', () {
+          new FakeAsync().run((async) {
+            var callCount = 0;
+            new Future(() => callCount++);
+            async.elapse(Duration.ZERO);
+            expect(callCount, 1);
+          });
+        });
+
+        test('should work with Future.delayed', () {
+          new FakeAsync().run((async) {
+            int result;
+            new Future.delayed(elapseBy, () => result = 5);
+            async.elapse(elapseBy);
+            expect(result, 5);
+          });
+        });
+
+        test('should work with Future.timeout', () {
+          new FakeAsync().run((async) {
+            var completer = new Completer();
+            var timed = completer.future.timeout(elapseBy ~/ 2);
+            expect(timed, throwsA(new isInstanceOf<TimeoutException>()));
+            async.elapse(elapseBy);
+            completer.complete();
+          });
+        });
+
+        // TODO: Pausing and resuming the timeout Stream doesn't work since
+        // it uses `new Stopwatch()`.
+        //
+        // See https://code.google.com/p/dart/issues/detail?id=18149
+        test('should work with Stream.periodic', () {
+          new FakeAsync().run((async) {
+            var events = <int>[];
+            StreamSubscription subscription;
+            var periodic =
+                new Stream.periodic(const Duration(minutes: 1), (i) => i);
+            subscription = periodic.listen(events.add, cancelOnError: true);
+            async.elapse(const Duration(minutes: 3));
+            subscription.cancel();
+            expect(events, [0, 1, 2]);
+          });
+        });
+
+        test('should work with Stream.timeout', () {
+          new FakeAsync().run((async) {
+            var events = <int>[];
+            var errors = [];
+            var controller = new StreamController();
+            var timed = controller.stream.timeout(const Duration(minutes: 2));
+            var subscription = timed.listen(events.add,
+                onError: errors.add, cancelOnError: true);
+            controller.add(0);
+            async.elapse(const Duration(minutes: 1));
+            expect(events, [0]);
+            async.elapse(const Duration(minutes: 1));
+            subscription.cancel();
+            expect(errors, hasLength(1));
+            expect(errors.first, new isInstanceOf<TimeoutException>());
+            return controller.close();
+          });
+        });
+      });
+    });
+
+    group('flushMicrotasks', () {
+      test('should flush a microtask', () {
+        new FakeAsync().run((async) {
+          bool microtaskRan = false;
+          new Future.microtask(() {
+            microtaskRan = true;
+          });
+          expect(microtaskRan, isFalse,
+              reason: 'should not flush until asked to');
+          async.flushMicrotasks();
+          expect(microtaskRan, isTrue);
+        });
+      });
+      test('should flush microtasks scheduled by microtasks in order', () {
+        new FakeAsync().run((async) {
+          final log = [];
+          new Future.microtask(() {
+            log.add(1);
+            new Future.microtask(() {
+              log.add(3);
+            });
+          });
+          new Future.microtask(() {
+            log.add(2);
+          });
+          expect(log, hasLength(0), reason: 'should not flush until asked to');
+          async.flushMicrotasks();
+          expect(log, [1, 2, 3]);
+        });
+      });
+      test('should not run timers', () {
+        new FakeAsync().run((async) {
+          final log = [];
+          new Future.microtask(() {
+            log.add(1);
+          });
+          new Future(() {
+            log.add(2);
+          });
+          new Timer.periodic(new Duration(seconds: 1), (_) {
+            log.add(2);
+          });
+          async.flushMicrotasks();
+          expect(log, [1]);
+        });
+      });
+    });
+
+    group('flushTimers', () {
+      test('should flush timers', () {
+        new FakeAsync().run((async) {
+          final log = [];
+          new Future(() {
+            log.add(2);
+            new Future.delayed(elapseBy, () {
+              log.add(3);
+            });
+          });
+          new Future(() {
+            log.add(1);
+          });
+          expect(log, hasLength(0), reason: 'should not flush until asked to');
+          async.flushTimers(timeout: elapseBy * 2, flushPeriodicTimers: false);
+          expect(log, [1, 2, 3]);
+          expect(async.getClock(initialTime).now(), initialTime.add(elapseBy));
+        });
+      });
+
+      test('should run collateral periodic timers', () {
+        new FakeAsync().run((async) {
+          final log = [];
+          new Future.delayed(new Duration(seconds: 2), () {
+            log.add('delayed');
+          });
+          new Timer.periodic(new Duration(seconds: 1), (_) {
+            log.add('periodic');
+          });
+          expect(log, hasLength(0), reason: 'should not flush until asked to');
+          async.flushTimers(flushPeriodicTimers: false);
+          expect(log, ['periodic', 'periodic', 'delayed']);
+        });
+      });
+
+      test('should timeout', () {
+        new FakeAsync().run((async) {
+          int count = 0;
+          // Schedule 3 timers. All but the last one should fire.
+          for (int delay in [30, 60, 90]) {
+            new Future.delayed(new Duration(minutes: delay), () {
+              count++;
+            });
+          }
+          expect(() => async.flushTimers(flushPeriodicTimers: false),
+              throwsStateError);
+          expect(count, 2);
+        });
+      });
+
+      test('should timeout a chain of timers', () {
+        new FakeAsync().run((async) {
+          int count = 0;
+          createTimer() {
+            new Future.delayed(new Duration(minutes: 30), () {
+              count++;
+              createTimer();
+            });
+          }
+          createTimer();
+          expect(() => async.flushTimers(
+                  timeout: new Duration(hours: 2), flushPeriodicTimers: false),
+              throwsStateError);
+          expect(count, 4);
+        });
+      });
+
+      test('should timeout periodic timers', () {
+        new FakeAsync().run((async) {
+          int count = 0;
+          new Timer.periodic(new Duration(minutes: 30), (Timer timer) {
+            count++;
+          });
+          expect(() => async.flushTimers(timeout: new Duration(hours: 1)),
+              throwsStateError);
+          expect(count, 2);
+        });
+      });
+
+      test('should flush periodic timers', () {
+        new FakeAsync().run((async) {
+          int count = 0;
+          new Timer.periodic(new Duration(minutes: 30), (Timer timer) {
+            if (count == 3) {
+              timer.cancel();
+            }
+            count++;
+          });
+          async.flushTimers(timeout: new Duration(hours: 20));
+          expect(count, 4);
+        });
+      });
+
+      test('should compute absolute timeout as elapsed + timeout', () {
+        new FakeAsync().run((async) {
+          final log = [];
+          int count = 0;
+          createTimer() {
+            new Future.delayed(new Duration(minutes: 30), () {
+              log.add(count);
+              count++;
+              if (count < 4) {
+                createTimer();
+              }
+            });
+          }
+          createTimer();
+          async.elapse(new Duration(hours: 1));
+          async.flushTimers(timeout: new Duration(hours: 1));
+          expect(count, 4);
+        });
+      });
+    });
+
+    group('stats', () {
+      test('should report the number of pending microtasks', () {
+        new FakeAsync().run((async) {
+          expect(async.microtaskCount, 0);
+          scheduleMicrotask(() => null);
+          expect(async.microtaskCount, 1);
+          scheduleMicrotask(() => null);
+          expect(async.microtaskCount, 2);
+          async.flushMicrotasks();
+          expect(async.microtaskCount, 0);
+        });
+      });
+
+      test('it should report the number of pending periodic timers', () {
+        new FakeAsync().run((async) {
+          expect(async.periodicTimerCount, 0);
+          Timer timer = new Timer.periodic(new Duration(minutes: 30),
+              (Timer timer) { });
+          expect(async.periodicTimerCount, 1);
+          new Timer.periodic(new Duration(minutes: 20), (Timer timer) { });
+          expect(async.periodicTimerCount, 2);
+          async.elapse(new Duration(minutes: 20));
+          expect(async.periodicTimerCount, 2);
+          timer.cancel();
+          expect(async.periodicTimerCount, 1);
+        });
+      });
+
+      test('it should report the number of pending non periodic timers', () {
+        new FakeAsync().run((async) {
+          expect(async.nonPeriodicTimerCount, 0);
+          Timer timer = new Timer(new Duration(minutes: 30), () { });
+          expect(async.nonPeriodicTimerCount, 1);
+          new Timer(new Duration(minutes: 20), () { });
+          expect(async.nonPeriodicTimerCount, 2);
+          async.elapse(new Duration(minutes: 25));
+          expect(async.nonPeriodicTimerCount, 1);
+          timer.cancel();
+          expect(async.nonPeriodicTimerCount, 0);
+        });
+      });
+    });
+  });
+}