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gaia/apps/video/test/unit/seeker_test.js

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+/* global Seeker, performance */
+'use strict';
+
+requireApp('/video/js/seeker.js');
+
+// We need a simple mock <video> element for these testsx
+function MockVideo() {
+  this.fastSeek = sinon.spy();
+  this.seekedHandlers = [];
+  this.addEventListener = function(type, handler) {
+    if (type === 'seeked') {
+      this.seekedHandlers.push(handler);
+    }
+  };
+  this._fireSeekedEvent = function() {
+    this.seekedHandlers.forEach((f) => {
+      typeof f === 'object' ? f.handleEvent() : f();
+    });
+  };
+}
+
+suite('seeker.js unit tests', function() {
+  var player, seeker;
+
+  setup(function() {
+    player = new MockVideo();
+    seeker = new Seeker(player);
+  });
+
+  test('it calls fastSeek()', function() {
+    seeker.seekTo(1);
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(1));
+  });
+
+  test('it doesn\'t seek twice to same spot', function() {
+    seeker.seekTo(1);
+    seeker.seekTo(1);
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(1));
+  });
+
+  test('it defers rapidly repeated seeks', function() {
+    seeker.seekTo(1);
+    seeker.seekTo(2);
+    seeker.seekTo(3);
+    seeker.seekTo(4);
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(1));
+    player._fireSeekedEvent();
+    assert.ok(player.fastSeek.calledTwice);
+    assert.ok(player.fastSeek.calledWith(4));
+    player._fireSeekedEvent();
+    assert.ok(player.fastSeek.calledTwice);
+  });
+
+  test('it does not defer seeks if previous seek has ended', function() {
+    seeker.seekTo(1);
+    player._fireSeekedEvent();
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(1));
+
+    seeker.seekTo(2);
+    assert.ok(player.fastSeek.calledTwice);
+    assert.ok(player.fastSeek.calledWith(2));
+    player._fireSeekedEvent();
+
+    seeker.seekTo(3);
+    assert.ok(player.fastSeek.calledThrice);
+    assert.ok(player.fastSeek.calledWith(3));
+  });
+
+  test('it does not defer seeks to 0', function() {
+    seeker.seekTo(4);
+    seeker.seekTo(3);
+    seeker.seekTo(2);
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(4));
+    seeker.seekTo(0);
+    assert.ok(player.fastSeek.calledTwice);
+    assert.ok(player.fastSeek.calledWith(0));
+    player._fireSeekedEvent();
+    assert.ok(player.fastSeek.calledTwice);
+  });
+
+  test('it does not defer long-distance seeks', function() {
+    seeker.seekTo(1);
+    assert.ok(player.fastSeek.calledOnce);
+    assert.ok(player.fastSeek.calledWith(1));
+    Seeker.SEEK_DISTANCE = 5;
+    seeker.seekTo(7);
+    assert.ok(player.fastSeek.calledTwice);
+    assert.ok(player.fastSeek.calledWith(7));
+    Seeker.SEEK_DISTANCE = 50;
+    seeker.seekTo(17); // not far enough, it gets deferred
+    assert.ok(player.fastSeek.calledTwice);
+    assert.ok(player.fastSeek.calledWith(7));
+    seeker.seekTo(58);
+    assert.ok(player.fastSeek.calledThrice);
+    assert.ok(player.fastSeek.calledWith(58));
+    player._fireSeekedEvent();
+    assert.ok(player.fastSeek.calledThrice);
+  });
+
+  test('it does not defer infrequent seeks', function() {
+    // We need to fake out performance.now() for this test
+    var realPerformanceNow = performance.now;
+    var time = 0;
+    performance.now = function() { return time; };
+
+    try {
+      seeker.seekTo(1);
+      assert.ok(player.fastSeek.calledOnce);
+      assert.ok(player.fastSeek.calledWith(1));
+      Seeker.SEEK_INTERVAL = 10;
+      time = 12;
+      seeker.seekTo(2);
+      assert.ok(player.fastSeek.calledTwice);
+      assert.ok(player.fastSeek.calledWith(2));
+      Seeker.SEEK_INTERVAL = 100;
+      time = 50;
+      seeker.seekTo(3);  // not enough fake time has passed, this is deferred
+      assert.ok(player.fastSeek.calledTwice);
+      assert.ok(player.fastSeek.calledWith(2));
+      time = 113;
+      seeker.seekTo(4);
+      assert.ok(player.fastSeek.calledThrice);
+      assert.ok(player.fastSeek.calledWith(4));
+      player._fireSeekedEvent();
+      assert.ok(player.fastSeek.calledThrice);
+    }
+    finally {
+      performance.now = realPerformanceNow;
+    }
+  });
+});