3 files changed, 13 insertions, 11 deletions
diff --git a/js/src/tests/test262/built-ins/Number/isNaN/length.js b/js/src/tests/test262/built-ins/Number/isNaN/length.js
index 302e20edf9..b196887226 100644
--- a/js/src/tests/test262/built-ins/Number/isNaN/length.js
+++ b/js/src/tests/test262/built-ins/Number/isNaN/length.js
@@ -22,10 +22,11 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(Number.isNaN.length, 1);
-
-verifyNotEnumerable(Number.isNaN, "length");
-verifyNotWritable(Number.isNaN, "length");
-verifyConfigurable(Number.isNaN, "length");
+verifyProperty(Number.isNaN, "length", {
+  value: 1,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Number/isNaN/name.js b/js/src/tests/test262/built-ins/Number/isNaN/name.js
index 4d97acdf97..caeb19ed3c 100644
--- a/js/src/tests/test262/built-ins/Number/isNaN/name.js
+++ b/js/src/tests/test262/built-ins/Number/isNaN/name.js
@@ -19,10 +19,11 @@ info: |
 includes: [propertyHelper.js]
 ---*/
 
-assert.sameValue(Number.isNaN.name, "isNaN");
-
-verifyNotEnumerable(Number.isNaN, "name");
-verifyNotWritable(Number.isNaN, "name");
-verifyConfigurable(Number.isNaN, "name");
+verifyProperty(Number.isNaN, "name", {
+  value: "isNaN",
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
 
 reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/Number/isNaN/not-a-constructor.js b/js/src/tests/test262/built-ins/Number/isNaN/not-a-constructor.js
index 482812547c..abca3f5a2e 100644
--- a/js/src/tests/test262/built-ins/Number/isNaN/not-a-constructor.js
+++ b/js/src/tests/test262/built-ins/Number/isNaN/not-a-constructor.js
@@ -25,7 +25,7 @@ assert.sameValue(isConstructor(Number.isNaN), false, 'isConstructor(Number.isNaN
 
 assert.throws(TypeError, () => {
   new Number.isNaN();
-}, '`new Number.isNaN()` throws TypeError');
+});
 
 
 reportCompare(0, 0);