diff --git a/target-config.js b/target-config.js
index 72ea2a0..d1a5800 100644
--- a/target-config.js
+++ b/target-config.js
@@ -79,7 +79,8 @@
       'test/js/group-constructors.js',
       'test/js/group-player.js',
       'test/js/group-player-finish-event.js',
-      'test/js/timeline.js');
+      'test/js/timeline.js',
+      'test/js/timing.js');
 
   // This object specifies the source and test files for different Web Animation build targets.
   var targetConfig = {
diff --git a/test/js/timing.js b/test/js/timing.js
new file mode 100644
index 0000000..561187b
--- /dev/null
+++ b/test/js/timing.js
@@ -0,0 +1,27 @@
+suite('timing-tests', function() {
+  setup(function() {
+    document.timeline._players = [];
+  });
+
+  test('animation iterations', function() {
+    var anim = new Animation(document.body, [], {
+      duration: 2000,
+      iterations: 2,
+      iterationStart: 0.5
+    });
+    assert.equal(anim.activeDuration, 4000);
+  });
+
+  test('group iterations', function() {
+    var anim = new Animation(document.body, [], {
+      duration: 2000
+    });
+    var group = new AnimationGroup([anim], {
+      iterations: 2,
+      iterationStart: 0.5/*,
+      duration: 2000*/
+      // note: fails even with explicit duration here, as opposed to 'auto'
+    });
+    assert.equal(group.activeDuration, 4000);
+  });
+});