Simplify array iterator tests

test/mjsunit/es6/array-iterator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 157 matching lines @@
 function TestForArrayValues() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
   var i = 0;
   for (var value of array.values()) {
     buffer[i++] = value;
   }
 
   assertEquals(8, buffer.length);
 
-  for (var i = 0; i < buffer.length - 1; i++) {
+  for (var i = 0; i < buffer.length; i++) {
     assertSame(array[i], buffer[i]);
   }
-  assertTrue(isNaN(buffer[buffer.length - 1]));
 }
 TestForArrayValues();
 
 
 function TestForArrayKeys() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
   var i = 0;
   for (var key of array.keys()) {
     buffer[i++] = key;
@@ skipping 11 matching lines @@
 function TestForArrayEntries() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
   var i = 0;
   for (var entry of array.entries()) {
     buffer[i++] = entry;
   }
 
   assertEquals(8, buffer.length);
 
-  for (var i = 0; i < buffer.length - 1; i++) {
+  for (var i = 0; i < buffer.length; i++) {
     assertSame(array[i], buffer[i][1]);
   }
-  assertTrue(isNaN(buffer[buffer.length - 1][1]));
 
   for (var i = 0; i < buffer.length; i++) {
     assertEquals(i, buffer[i][0]);
   }
 }
 TestForArrayEntries();
 
 
 function TestForArray() {
   var buffer = [];
   var array = [0, 'a', true, false, null, /* hole */, undefined, NaN];
   var i = 0;
   for (var value of array) {
     buffer[i++] = value;
   }
 
   assertEquals(8, buffer.length);
 
-  for (var i = 0; i < buffer.length - 1; i++) {
+  for (var i = 0; i < buffer.length; i++) {
     assertSame(array[i], buffer[i]);
   }
-  assertTrue(isNaN(buffer[buffer.length - 1]));
 }
 TestForArrayValues();
 
 
 function TestNonOwnSlots() {
   var array = [0];
   var iterator = array.values();
   var object = {__proto__: iterator};
 
   assertThrows(function() {
     object.next();
   }, TypeError);
 }
 TestNonOwnSlots();