1 files changed, 2 insertions, 8 deletions
diff --git a/test/built-ins/Array/prototype/indexOf/15.4.4.14-9-10.js b/test/built-ins/Array/prototype/indexOf/15.4.4.14-9-10.js
index 41d62527c..ec885dadd 100644
--- a/test/built-ins/Array/prototype/indexOf/15.4.4.14-9-10.js
+++ b/test/built-ins/Array/prototype/indexOf/15.4.4.14-9-10.js
@@ -7,15 +7,9 @@ info: >
     and hence NaNs could be found using indexOf *
 es5id: 15.4.4.14-9-10
 description: Array.prototype.indexOf must return correct index (NaN)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
   var _NaN = NaN;
   var a = new Array("NaN",undefined,0,false,null,{toString:function (){return NaN}},"false",_NaN,NaN);
-  if (a.indexOf(NaN) === -1)  // NaN is equal to nothing, including itself.
-  {
-    return true;
-  }
- }
-runTestCase(testcase);
+
+assert.sameValue(a.indexOf(NaN), -1, 'NaN is equal to nothing, including itself.');