3 files changed, 13 insertions, 11 deletions
diff --git a/js/src/tests/test262/built-ins/isNaN/length.js b/js/src/tests/test262/built-ins/isNaN/length.js
index 01e06d1602..f323904d00 100644
--- a/js/src/tests/test262/built-ins/isNaN/length.js
+++ b/js/src/tests/test262/built-ins/isNaN/length.js
@@ -8,10 +8,11 @@ description: >
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(isNaN.length, 1, "The value of `isNaN.length` is `1`");
-
-verifyNotEnumerable(isNaN, "length");
-verifyNotWritable(isNaN, "length");
-verifyConfigurable(isNaN, "length");
+verifyProperty(isNaN, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/isNaN/name.js b/js/src/tests/test262/built-ins/isNaN/name.js
index 967a74566e..515478acae 100644
--- a/js/src/tests/test262/built-ins/isNaN/name.js
+++ b/js/src/tests/test262/built-ins/isNaN/name.js
@@ -19,10 +19,11 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(isNaN.name, "isNaN");
-
-verifyNotEnumerable(isNaN, "name");
-verifyNotWritable(isNaN, "name");
-verifyConfigurable(isNaN, "name");
+verifyProperty(isNaN, "name", {
+  value: "isNaN",
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/isNaN/not-a-constructor.js b/js/src/tests/test262/built-ins/isNaN/not-a-constructor.js
index 840489d16b..ca7970390e 100644
--- a/js/src/tests/test262/built-ins/isNaN/not-a-constructor.js
+++ b/js/src/tests/test262/built-ins/isNaN/not-a-constructor.js
@@ -25,7 +25,7 @@ assert.sameValue(isConstructor(isNaN), false, 'isConstructor(isNaN) must return
 
 assert.throws(TypeError, () => {
   new isNaN(1);
-}, '`new isNaN(1)` throws TypeError');
+});
 
 
 reportCompare(0, 0);