Add analogous tests

Introduce additional tests to increase parity in coverage between
generator expressions and generator statements.

test/language/expressions/generators/has-instance.js

@@ -0,0 +1,13 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    A Generator object is an instance of a generator function.
+es6id: 25.3
+---*/
+
+var g = function*() {};
+
+assert(g() instanceof g, 'Instance created via function invocation');
+assert(new g() instanceof g, 'Instance created via constructor invocation');

test/language/expressions/generators/length-property-descriptor.js

@@ -0,0 +1,16 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Generator objects should define a `length` property.
+includes: [propertyHelper.js]
+es6id: 25.2.4
+---*/
+
+var g = function*() {};
+
+assert.sameValue(g.length, 0);
+verifyNotEnumerable(g, 'length');
+verifyNotWritable(g, 'length');
+verifyConfigurable(g, 'length');

test/language/expressions/generators/name-property-descriptor.js

@@ -0,0 +1,16 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Generator functions should define a `name` property.
+includes: [propertyHelper.js]
+es6id: 25.2.4
+---*/
+
+var g = function*() {};
+
+assert.sameValue(g.name, 'g');
+verifyNotEnumerable(g, 'name');
+verifyNotWritable(g, 'name');
+verifyConfigurable(g, 'name');

test/language/expressions/generators/prototype-property-descriptor.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Generator objects should define a `prototype` property.
+includes: [propertyHelper.js]
+es6id: 25.2.4
+---*/
+
+var g = function*() {};
+
+verifyNotEnumerable(g, 'prototype');
+verifyWritable(g, 'prototype');
+verifyNotConfigurable(g, 'prototype');

test/language/expressions/generators/prototype-relation-to-function.js

@@ -0,0 +1,17 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    The value of the [[Prototype]] internal slot of the GeneratorFunction
+    prototype object is the FunctionPrototype intrinsic object.
+es6id: 25.2.2.2
+---*/
+
+function f() {}
+var g = function*() {};
+
+assert.sameValue(
+  Object.getPrototypeOf(Object.getPrototypeOf(g)),
+  Object.getPrototypeOf(f)
+);

test/language/expressions/generators/prototype-typeof.js

@@ -0,0 +1,11 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.2.4.2
+description: >
+    Whenever a GeneratorFunction instance is created another ordinary object is
+    also created and is the initial value of the generator function’s prototype
+    property.
+---*/
+
+assert.sameValue(typeof function*() {}.prototype, 'object');

test/language/expressions/generators/prototype-value.js

@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Generator instances directly inherit properties from the object that is the
+    value of the prototype property of the Generator function that created the
+    instance.
+es6id: 25.3
+---*/
+
+var g = function*() {};
+
+assert.sameValue(
+  Object.getPrototypeOf(g()),
+  g.prototype,
+  'Instance created via function invocation'
+);
+assert.sameValue(
+  Object.getPrototypeOf(new g()),
+  g.prototype,
+  'Instance created via constructor invocation'
+);

test/language/statements/generators/prototype-own-properties.js

@@ -0,0 +1,12 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.2.4.2
+description: >
+    The `prototype` property of GeneratorFunction instances are created as
+    plain objects with no "own" properties.
+---*/
+
+function* g() {}
+var ownProperties = Object.getOwnPropertyNames(g.prototype);
+assert.sameValue(ownProperties.length, 0);