diff --git a/test/built-ins/Array/prototype/concat/15.4.4.4-5-b-iii-3-b-1.js b/test/built-ins/Array/prototype/concat/15.4.4.4-5-b-iii-3-b-1.js
index b256b0c1a6..68f689d306 100644
--- a/test/built-ins/Array/prototype/concat/15.4.4.4-5-b-iii-3-b-1.js
+++ b/test/built-ins/Array/prototype/concat/15.4.4.4-5-b-iii-3-b-1.js
@@ -6,6 +6,7 @@ esid: sec-array.prototype.concat
 description: >
     Array.prototype.concat will concat an Array when index property
     (read-only) exists in Array.prototype (Step 5.b.iii.3.b)
+includes: [propertyHelper.js]
 ---*/
 
 Object.defineProperty(Array.prototype, "0", {
@@ -15,28 +16,11 @@ Object.defineProperty(Array.prototype, "0", {
 });
 
 var oldArr = [101];
-
 var newArr = Array.prototype.concat.call(oldArr);
 
-var verifyValue = false;
-verifyValue = newArr[0] === 101;
-
-var verifyEnumerable = false;
-for (var p in newArr) {
-  if (p === "0" && newArr.hasOwnProperty("0")) {
-    verifyEnumerable = true;
-  }
-}
-
-var verifyWritable = false;
-newArr[0] = 12;
-verifyWritable = newArr[0] === 12;
-
-var verifyConfigurable = false;
-delete newArr[0];
-verifyConfigurable = newArr.hasOwnProperty("0");
-
-assert(verifyValue, 'verifyValue !== true');
-assert.sameValue(verifyConfigurable, false, 'verifyConfigurable');
-assert(verifyEnumerable, 'verifyEnumerable !== true');
-assert(verifyWritable, 'verifyWritable !== true');
+verifyProperty(newArr, "0", {
+  value: 101,
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});
diff --git a/test/built-ins/Array/prototype/concat/15.4.4.4-5-c-i-1.js b/test/built-ins/Array/prototype/concat/15.4.4.4-5-c-i-1.js
index f7b3a92419..274d5b83b7 100644
--- a/test/built-ins/Array/prototype/concat/15.4.4.4-5-c-i-1.js
+++ b/test/built-ins/Array/prototype/concat/15.4.4.4-5-c-i-1.js
@@ -6,6 +6,7 @@ esid: sec-array.prototype.concat
 description: >
     Array.prototype.concat will concat an Array when index property
     (read-only) exists in Array.prototype (Step 5.c.i)
+includes: [propertyHelper.js]
 ---*/
 
 Object.defineProperty(Array.prototype, "0", {
@@ -16,31 +17,9 @@ Object.defineProperty(Array.prototype, "0", {
 
 var newArr = Array.prototype.concat.call(101);
 
-var hasProperty = newArr.hasOwnProperty("0");
-
-var instanceOfVerify = typeof newArr[0] === "object";
-
-var verifyValue = false;
-verifyValue = newArr[0] == 101;
-
-var verifyEnumerable = false;
-for (var p in newArr) {
-  if (p === "0" && newArr.hasOwnProperty("0")) {
-    verifyEnumerable = true;
-  }
-}
-
-var verifyWritable = false;
-newArr[0] = 12;
-verifyWritable = newArr[0] === 12;
-
-var verifyConfigurable = false;
-delete newArr[0];
-verifyConfigurable = newArr.hasOwnProperty("0");
-
-assert(hasProperty, 'hasProperty !== true');
-assert(instanceOfVerify, 'instanceOfVerify !== true');
-assert(verifyValue, 'verifyValue !== true');
-assert.sameValue(verifyConfigurable, false, 'verifyConfigurable');
-assert(verifyEnumerable, 'verifyEnumerable !== true');
-assert(verifyWritable, 'verifyWritable !== true');
+assert(newArr[0] instanceof Number);
+verifyProperty(newArr, "0", {
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});