Add tests for Number.EPSILON

test/built-ins/Number/EPSILON.js

+// Copyright (C) 2016 The V8 Project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 20.1.2.1
+esid: sec-number.epsilon
+description: >
+  "EPSILON" property of Number
+info: >
+  20.1.2.1 Number.EPSILON
+
+  The value of Number.EPSILON is the difference between 1 and the smallest value
+  greater than 1 that is representable as a Number value, which is approximately
+  2.2204460492503130808472633361816 x 10-16.
+
+  This property has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+  [[Configurable]]: false }.
+includes: [propertyHelper.js]
+---*/
+
+assert(
+  Number.EPSILON > 0,
+  "value is greater than 0"
+);
+assert(
+  Number.EPSILON < 0.000001,
+  "value is smaller than 0.000001"
+);
+
+verifyNotEnumerable(Number, "EPSILON");
+verifyNotWritable(Number, "EPSILON");
+verifyNotConfigurable(Number, "EPSILON");