diff --git a/test/_transformation-helper.js b/test/_transformation-helper.js
index 0539c6b79a..a1da9ce4bf 100644
--- a/test/_transformation-helper.js
+++ b/test/_transformation-helper.js
@@ -16,6 +16,14 @@ global.assertNoOwnProperties = function (obj) {
   assert.equal(Object.getOwnPropertyNames(obj).length, 0);
 };
 
+global.assertHasOwnProperty = function () {
+
+};
+
+global.assertLacksOwnProperty = function () {
+
+};
+
 global.assertArrayEquals = assert.deepEqual;
 global.assert = chai.assert;
 global.chai = chai;
@@ -129,12 +137,7 @@ module.exports = function (suiteOpts, taskOpts, dynamicOpts) {
 
         var runTest = function (done) {
           var runTask = function () {
-            try {
-              run(task, done);
-            } catch (err) {
-              if (task.options.after) task.options.after();
-              throw err;
-            }
+            run(task, done);
           };
 
           _.extend(task.options, taskOpts);
diff --git a/test/traceur.js b/test/traceur.js
index 72dc64e7fc..1c5f9f91fc 100644
--- a/test/traceur.js
+++ b/test/traceur.js
@@ -10,6 +10,18 @@ require("./_transformation-helper")({
   loc: __dirname + "/../vendor/traceur/test/feature",
 
   ignoreSuites: [
+    "Modules",
+    "Classes",
+
+    // these are the responsibility of regenerator
+    "AsyncFunctions",
+    "Yield",
+
+    // these are the responsibility of core-js
+    "StringExtras",
+    "ArrayExtras",
+    "Collections",
+
     // these are all internal traceur tests or non-standard features
     "ObjectMixin",
     "Annotations",
@@ -24,9 +36,24 @@ require("./_transformation-helper")({
   ],
 
   ignoreTasks: [
-    // core.js doesn't support due to a perf hit and having to override a lot
-    // of native methods
+    // these are the responsibility of core-js
     "Symbol/GetOwnPropertySymbols",
+    "Spread/Type",
+    "Symbol/ObjectModel",
+    "Symbol/Object",
+    "Spread/NoIterator",
+    "Destructuring/Rest",
+    "Destructuring/Empty",
+
+    // traceur uses an old version of regexpu
+    "RegularExpression/Simple",
+
+    // class methods are still enumerable in traceur
+    "NumericLiteral/Simple",
+    "Classes/Method",
+
+    // Object.mixin didn't make it into ES6
+    "ObjectMixin",
 
     // traceur doesn't name methods and has an incorrect test asserting that
     // they have no names
@@ -38,20 +65,17 @@ require("./_transformation-helper")({
     "Syntax/UseStrictLineContinuation",
 
     // experimental es7 - the spec hasn't been finalized yet
-    // these both fail because of filter between blocks
+    // these both fail because of filters between blocks
     "ArrayComprehension/Simple",
     "GeneratorComprehension/Simple",
 
-    // yield has been added as a keyword in ES6 so this test is actually incorrect
-    "Yield/YieldIdentifier"
+    // yield has been added as a keyword in ES6
+    "Yield/YieldIdentifier",
+    "Syntax/StrictKeywords"
   ]
 }, {
-  optional: ["typeofSymbol"],
-  experimental: true,
-  after: function () {
-    // StringExtras/StarsWith
-    delete Object.prototype[1];
-  }
+  optional: ["spec.typeofSymbol"],
+  experimental: true
 }, function (opts, task) {
   if (!_.contains(task.exec.loc, "module.js")) {
     opts.blacklist = ["useStrict"];