diff --git a/test/intl402/Collator/prototype/prop-desc.js b/test/intl402/Collator/prototype/prop-desc.js
index 879362e449..f49a97bcfd 100644
--- a/test/intl402/Collator/prototype/prop-desc.js
+++ b/test/intl402/Collator/prototype/prop-desc.js
@@ -5,10 +5,11 @@
 es5id: 10.2.1
 description: Tests that Intl.Collator.prototype has the required attributes.
 author: Norbert Lindenberg
+includes: [propertyHelper.js]
 ---*/
 
-var desc = Object.getOwnPropertyDescriptor(Intl.Collator, "prototype");
-assert.notSameValue(desc, undefined, "Intl.Collator.prototype is not defined.");
-assert.sameValue(desc.writable, false, "Intl.Collator.prototype must not be writable.");
-assert.sameValue(desc.enumerable, false, "Intl.Collator.prototype must not be enumerable.");
-assert.sameValue(desc.configurable, false, "Intl.Collator.prototype must not be configurable.");
+verifyProperty(Intl.Collator, "prototype", {
+    writable: false,
+    enumerable: false,
+    configurable: false,
+});
diff --git a/test/intl402/DateTimeFormat/prototype/prop-desc.js b/test/intl402/DateTimeFormat/prototype/prop-desc.js
index 192b58d21f..5cd5948a0c 100644
--- a/test/intl402/DateTimeFormat/prototype/prop-desc.js
+++ b/test/intl402/DateTimeFormat/prototype/prop-desc.js
@@ -7,10 +7,11 @@ description: >
     Tests that Intl.DateTimeFormat.prototype has the required
     attributes.
 author: Norbert Lindenberg
+includes: [propertyHelper.js]
 ---*/
 
-var desc = Object.getOwnPropertyDescriptor(Intl.DateTimeFormat, "prototype");
-assert.notSameValue(desc, undefined, "Intl.DateTimeFormat.prototype is not defined.");
-assert.sameValue(desc.writable, false, "Intl.DateTimeFormat.prototype must not be writable.");
-assert.sameValue(desc.enumerable, false, "Intl.DateTimeFormat.prototype must not be enumerable.");
-assert.sameValue(desc.configurable, false, "Intl.DateTimeFormat.prototype must not be configurable.");
+verifyProperty(Intl.DateTimeFormat, "prototype", {
+    writable: false,
+    enumerable: false,
+    configurable: false,
+});
diff --git a/test/intl402/NumberFormat/prototype/prop-desc.js b/test/intl402/NumberFormat/prototype/prop-desc.js
index 7e29d28287..99f1f2bc6a 100644
--- a/test/intl402/NumberFormat/prototype/prop-desc.js
+++ b/test/intl402/NumberFormat/prototype/prop-desc.js
@@ -5,10 +5,11 @@
 es5id: 11.2.1
 description: Tests that Intl.NumberFormat.prototype has the required attributes.
 author: Norbert Lindenberg
+includes: [propertyHelper.js]
 ---*/
 
-var desc = Object.getOwnPropertyDescriptor(Intl.NumberFormat, "prototype");
-assert.notSameValue(desc, undefined, "Intl.NumberFormat.prototype is not defined.");
-assert.sameValue(desc.writable, false, "Intl.NumberFormat.prototype must not be writable.");
-assert.sameValue(desc.enumerable, false, "Intl.NumberFormat.prototype must not be enumerable.");
-assert.sameValue(desc.configurable, false, "Intl.NumberFormat.prototype must not be configurable.");
+verifyProperty(Intl.NumberFormat, "prototype", {
+    writable: false,
+    enumerable: false,
+    configurable: false,
+});
diff --git a/test/intl402/PluralRules/prototype/properties.js b/test/intl402/PluralRules/prototype/properties.js
index 56faeca8a3..13147faf00 100644
--- a/test/intl402/PluralRules/prototype/properties.js
+++ b/test/intl402/PluralRules/prototype/properties.js
@@ -5,10 +5,11 @@
 esid: sec-properties-of-intl-pluralrules-prototype-object
 description: Tests that Intl.PluralRules.prototype has the required attributes.
 author: Zibi Braniecki
+includes: [propertyHelper.js]
 ---*/
 
-var desc = Object.getOwnPropertyDescriptor(Intl.PluralRules, "prototype");
-assert.notSameValue(desc, undefined, "Intl.PluralRules.prototype is not defined.");
-assert.sameValue(desc.writable, false, "Intl.PluralRules.prototype must not be writable.");
-assert.sameValue(desc.enumerable, false, "Intl.PluralRules.prototype must not be enumerable.");
-assert.sameValue(desc.configurable, false, "Intl.PluralRules.prototype must not be configurable.");
+verifyProperty(Intl.PluralRules, "prototype", {
+    writable: false,
+    enumerable: false,
+    configurable: false,
+});