3 files changed, 13 insertions, 17 deletions
diff --git a/js/src/tests/test262/built-ins/WeakSet/prototype/add/length.js b/js/src/tests/test262/built-ins/WeakSet/prototype/add/length.js
index 7112319f12..f6b1312673 100644
--- a/js/src/tests/test262/built-ins/WeakSet/prototype/add/length.js
+++ b/js/src/tests/test262/built-ins/WeakSet/prototype/add/length.js
@@ -11,13 +11,11 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(
-  WeakSet.prototype.add.length, 1,
-  'The value of `WeakSet.prototype.add.length` is `1`'
-);
-
-verifyNotEnumerable(WeakSet.prototype.add, 'length');
-verifyNotWritable(WeakSet.prototype.add, 'length');
-verifyConfigurable(WeakSet.prototype.add, 'length');
+verifyProperty(WeakSet.prototype.add, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/WeakSet/prototype/add/name.js b/js/src/tests/test262/built-ins/WeakSet/prototype/add/name.js
index e81470dc1c..5383bbd19a 100644
--- a/js/src/tests/test262/built-ins/WeakSet/prototype/add/name.js
+++ b/js/src/tests/test262/built-ins/WeakSet/prototype/add/name.js
@@ -11,13 +11,11 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(
-  WeakSet.prototype.add.name, 'add',
-  'The value of WeakSet.prototype.add.name is "add"'
-);
-
-verifyNotEnumerable(WeakSet.prototype.add, 'name');
-verifyNotWritable(WeakSet.prototype.add, 'name');
-verifyConfigurable(WeakSet.prototype.add, 'name');
+verifyProperty(WeakSet.prototype.add, "name", {
+  value: "add",
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/WeakSet/prototype/add/not-a-constructor.js b/js/src/tests/test262/built-ins/WeakSet/prototype/add/not-a-constructor.js
index df2a033c51..3024ce6299 100644
--- a/js/src/tests/test262/built-ins/WeakSet/prototype/add/not-a-constructor.js
+++ b/js/src/tests/test262/built-ins/WeakSet/prototype/add/not-a-constructor.js
@@ -29,7 +29,7 @@ assert.sameValue(
 
 assert.throws(TypeError, () => {
   let ws = new WeakSet(); new ws.add({});
-}, '`let ws = new WeakSet(); new ws.add({})` throws TypeError');
+});
 
 
 reportCompare(0, 0);