| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="mock_timer.js"></script> |
| </head> |
| <body> |
| <script> |
| |
| var mockTimer; |
| |
| /** |
| * Counter class for tallying the number if times a calback is triggered. |
| * @constructor |
| */ |
| function ClickCounter() { |
| } |
| |
| ClickCounter.prototype = { |
| /** |
| * Nubmer of times the callback was triggered. |
| * @type{number} |
| * @private |
| */ |
| clickCount_: 0, |
| |
| /** Increments click count */ |
| tick: function() { |
| this.clickCount_++; |
| }, |
| |
| /** |
| * Creates a callback function that tracks the number of calls. |
| * @return {!Function} |
| */ |
| createCallback: function() { |
| var self = this; |
| return function() { |
| self.tick(); |
| }; |
| }, |
| |
| /** |
| * Nubmer of times the callback was triggered. |
| * @type {number} |
| */ |
| get value() { |
| return this.clickCount_; |
| } |
| } |
| |
| function setUp() { |
| mockTimer = new MockTimer(); |
| mockTimer.install(); |
| } |
| |
| function tearDown() { |
| mockTimer.uninstall(); |
| } |
| |
| function testSetTimeout() { |
| var counter = new ClickCounter(); |
| window.setTimeout(counter.createCallback(), 100); |
| assertEquals(0, counter.value); |
| mockTimer.tick(50); |
| assertEquals(0, counter.value); |
| mockTimer.tick(100); |
| assertEquals(1, counter.value); |
| mockTimer.tick(100); |
| assertEquals(1, counter.value); |
| } |
| |
| function testClearTimeout() { |
| var counter = new ClickCounter(); |
| var t = window.setTimeout(counter.createCallback(), 100); |
| |
| // Verify that clearing a timeout before the elapsed time does not trigger |
| // the callback. |
| window.clearTimeout(t); |
| mockTimer.tick(200); |
| assertEquals(0, counter.value); |
| } |
| |
| function testSetAndClearInterval() { |
| var counter = new ClickCounter(); |
| var t = window.setInterval(counter.createCallback(), 100); |
| |
| // Verify that callback doesn't fire before elapsed interval. |
| assertEquals(0, counter.value); |
| mockTimer.tick(50); |
| |
| // Verify that each elapsed time interval advances the count by 1. |
| assertEquals(0, counter.value); |
| mockTimer.tick(100); |
| assertEquals(1, counter.value); |
| mockTimer.tick(100); |
| assertEquals(2, counter.value); |
| mockTimer.tick(100); |
| assertEquals(3, counter.value); |
| |
| // Verify that callbacks stop firing after timer is cleared. |
| window.clearInterval(t); |
| mockTimer.tick(100); |
| assertEquals(3, counter.value); |
| } |
| |
| function testInterleavedTimers() { |
| var results = ''; |
| var createCallback = function(response) { |
| var label = response; |
| return function() { |
| results = results + label; |
| }; |
| }; |
| |
| // Verify callbacks are properly interleaved. |
| var t1 = window.setInterval(createCallback('A'), 7); |
| var t2 = window.setInterval(createCallback('B'), 13); |
| mockTimer.tick(30); |
| assertEquals('ABAABA', results); |
| mockTimer.tick(30); |
| assertEquals('ABAABAABAABA', results); |
| |
| window.clearInterval(t1); |
| window.setTimeout(createCallback('C'), 11); |
| mockTimer.tick(30); |
| assertEquals('ABAABAABAABABCB', results); |
| |
| window.clearInterval(t2); |
| mockTimer.tick(30); |
| assertEquals('ABAABAABAABABCB', results); |
| } |
| |
| </script> |
| </body> |
| </html> |
