Add `System.global` tests (#567)

test/built-ins/System/System.js

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+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-system
+description: The System object is an ordinary object.
+info: >
+  The System Object
+
+  The System object is the %System% intrinsic object and the initial value of
+  the System property of the global object. The System object is an ordinary
+  object.
+
+  The System object is not a function object. It does not have a [[Construct]]
+  internal method; it is not possible to use the System object as a constructor
+  with the new operator. The System object also does not have a [[Call]]
+  internal method; it is not possible to invoke the System object as a
+  function.
+---*/
+
+assert.sameValue(typeof System, 'object', '`typeof System` is `"object"`');
+
+// System is not callable
+assert.throws(TypeError, function() {
+  System();
+});
+
+// System doesn't have a constructor
+assert.throws(TypeError, function() {
+  new System();
+});

test/built-ins/System/global/global-object.js

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+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-system.global
+description: System.global should be the global object
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(this, System.global);
+
+assert.sameValue(Array, System.global.Array);
+assert.sameValue(Boolean, System.global.Boolean);
+assert.sameValue(Date, System.global.Date);
+assert.sameValue(Error, System.global.Error);
+assert.sameValue(Function, System.global.Function);
+assert.sameValue(JSON, System.global.JSON);
+assert.sameValue(Math, System.global.Math);
+assert.sameValue(Number, System.global.Number);
+assert.sameValue(RegExp, System.global.RegExp);
+assert.sameValue(String, System.global.String);
+assert.sameValue(System, System.global.System);
+
+globalVariable = {};
+assert.sameValue(globalVariable, System.global.globalVariable);

test/built-ins/System/global/property-descriptor.js

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+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-system.global
+description: System.global should be non-writable, non-enumerable, and configurable
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+verifyNotEnumerable(System, 'global');
+verifyNotWritable(System, 'global');
+verifyConfigurable(System, 'global');

test/built-ins/System/object-prototype.js

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+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: system
+description: >
+  The value of the [[Prototype]] internal slot of the System object
+  is the intrinsic object %ObjectPrototype% (19.1.3).
+---*/
+
+assert.sameValue(
+  Object.getPrototypeOf(System),
+  Object.prototype,
+  '`Object.getPrototypeOf(System)` returns `Object.prototype`'
+);

test/built-ins/System/properties.js

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+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: system
+description: >
+  System is configurable, writable, and not enumerable.
+info: >
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+verifyNotEnumerable(this, 'System');
+verifyWritable(this, 'System');
+verifyConfigurable(this, 'System');