IDBObserver: Lifetime Management: Adding Observer

third_party/WebKit/LayoutTests/storage/indexeddb/resources/observer.js

 if (this.importScripts) {
     importScripts('../../../resources/testharness.js');
 }
 
 function callback(){};
 
 async_test(function(t) {
-    var description = 'observers constructor test';
-    var dbname = location.pathname + ' - ' + description;
-    var openRequest = indexedDB.open(dbname);
-    var obs1 = new IDBObserver(callback, {transaction: true, values: true});
-    openRequest.onupgradeneeded = t.step_func(function() {
-        var db = openRequest.result;
-        db.createObjectStore('store');
-    });
-    openRequest.onsuccess = t.step_func(function() {
-        var db = openRequest.result;
-        var tx = db.transaction('store', 'readwrite');
+  var description = 'observer addition and removal test';
+  var dbname = location.pathname + ' - ' + description;
+  var openRequest = indexedDB.open(dbname);
+  var obs1 = new IDBObserver(callback, {transaction: true, values: true});
+  var obs2 = new IDBObserver(callback, {transaction: true, values: true});
+
+  openRequest.onupgradeneeded = t.step_func(function() {
+      var db = openRequest.result;
+      db.createObjectStore('store');
+  });
+  openRequest.onsuccess = t.step_func(function() {
+    var db = openRequest.result;
+    var tx = db.transaction('store', 'readwrite');
+    var store = tx.objectStore('store');
+        var put_request = store.put(1,1);
         obs1.observe(db, tx);
-        t.done();
-    });
-
-}, 'observers constructor test');
+        obs1.unobserve(db);
+        obs1.observe(db, tx);
+        obs2.observe(db, tx);
+        tx.oncomplete = t.step_func(function(){
+          obs1.unobserve(db);
+          t.done();
+        });
+      });
+}, 'observer addition and removal test');
 
 done();