Add Array.prototype.every.length tests

test/built-ins/Array/prototype/every/length.js

@@ -0,0 +1,20 @@
+// Copyright (C) 2017 Corey Frang. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.every
+description: >
+  Array.prototype.every.length value and property descriptor
+info: >
+  Array.prototype.every ( callbackfn [ , thisArg] )
+  The length property of the of function is 1.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  Array.prototype.every.length, 1,
+  'The value of `Array.prototype.every.length` is `1`'
+);
+
+verifyNotEnumerable(Array.prototype.every, 'length');
+verifyNotWritable(Array.prototype.every, 'length');
+verifyConfigurable(Array.prototype.every, 'length');