1 files changed, 72 insertions, 0 deletions
diff --git a/addons/website/static/lib/MutationObservers/test/callback.js b/addons/website/static/lib/MutationObservers/test/callback.js
new file mode 100644
index 00000000000..b3083c7bec3
--- /dev/null
+++ b/addons/website/static/lib/MutationObservers/test/callback.js
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2012 The Polymer Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+suite('JsMutationObserver callback', function() {
+
+  test('One observer, two attribute changes', function(cont) {
+    var div = document.createElement('div');
+    var observer = new JsMutationObserver(function(records) {
+      assert.strictEqual(records.length, 2);
+
+      expectRecord(records[0], {
+        type: 'attributes',
+        target: div,
+        attributeName: 'a',
+        attributeNamespace: null
+      });
+      expectRecord(records[1], {
+        type: 'attributes',
+        target: div,
+        attributeName: 'a',
+        attributeNamespace: null
+      });
+
+      cont();
+    });
+
+    observer.observe(div, {
+      attributes: true
+    });
+
+    div.setAttribute('a', 'A');
+    div.setAttribute('a', 'B');
+  });
+
+  test('nested changes', function(cont) {
+    var div = document.createElement('div');
+    var i = 0;
+    var observer = new JsMutationObserver(function(records) {
+      assert.strictEqual(records.length, 1);
+
+      if (i === 0) {
+        expectRecord(records[0], {
+          type: 'attributes',
+          target: div,
+          attributeName: 'a',
+          attributeNamespace: null
+        });
+        div.setAttribute('b', 'B');
+        i++;
+      } else {
+        expectRecord(records[0], {
+          type: 'attributes',
+          target: div,
+          attributeName: 'b',
+          attributeNamespace: null
+        });
+
+        cont();
+      }
+    });
+
+    observer.observe(div, {
+      attributes: true
+    });
+
+    div.setAttribute('a', 'A');
+  });
+
+});
+\ No newline at end of file