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gaia/apps/clock/test/unit/async_queue_test.js

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+'use strict';
+
+suite('AsyncQueue', function() {
+  var AsyncQueue;
+  suiteSetup(function(done) {
+    require(['async_queue'], function(async_queue) {
+      AsyncQueue = async_queue;
+      done();
+    });
+  });
+
+  test('runs operations serially', function(done) {
+    // Construct the string "hello", one character at a time. We
+    // assign each task different durations to ensure that no matter
+    // how long each operation takes, the result remains in the same
+    // order as the tasks were added.
+    var result = '';
+    var queue = new AsyncQueue();
+
+    var clock = this.sinon.useFakeTimers();
+
+    function addTask(timeout, character) {
+      queue.push(function(taskFinished) {
+        setTimeout(function() {
+          result += character;
+          taskFinished();
+        }, timeout);
+        clock.tick(10);
+      });
+    }
+
+    addTask(50, 'h');
+    addTask(10, 'e');
+    addTask(0, 'l');
+    addTask(30, 'l');
+    addTask(20, 'o');
+
+    queue.push(function() {
+      assert.equal(result, 'hello');
+      clock.restore();
+      done();
+    });
+
+    clock.tick(100);
+  });
+
+  test('continues after queue is empty', function(done) {
+    var queue = new AsyncQueue();
+    queue.push(function(taskFinished) {
+      taskFinished();
+      setTimeout(function() {
+        queue.push(function() {
+          done();
+        });
+      }, 0);
+    });
+  });
+
+});
+