Add tests for instances of Async/Generator Functions that are not constructors (#907)

Fixes #779

3 files changed, 67 insertions, 16 deletions

diff --git a/test/built-ins/AsyncFunction/instance-construct-throws.js b/test/built-ins/AsyncFunction/instance-construct-throws.js
new file mode 100644
index 000000000..415aecb5e
--- /dev/null
+++ b/test/built-ins/AsyncFunction/instance-construct-throws.js
@@ -0,0 +1,38 @@
+// Copyright 2016 Microsoft, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Brian Terlson <brian.terlson@microsoft.com>
+esid: pending
+description: >
+  Async function instances are not constructors and do not have a
+  [[Construct]] slot.
+info: |
+    25.5.1.1 AsyncFunction( p1, p2, … , pn, body )
+
+    ...
+    3. Return CreateDynamicFunction(C, NewTarget, "async", args).
+
+    19.2.1.1.1 Runtime Semantics: CreateDynamicFunction( constructor, newTarget, kind, args )
+
+    ...
+    33. Perform FunctionInitialize(F, Normal, parameters, body, scope).
+    34. If kind is "generator", then
+        ...
+    35. Else if kind is "normal", perform MakeConstructor(F).
+    36. NOTE: Async functions are not constructable and do not have a [[Construct]] internal method
+        or a  "prototype" property.
+    ...
+---*/
+
+async function foo() { }
+assert.throws(TypeError, function() {
+  new foo();
+});
+
+var AsyncFunction = Object.getPrototypeOf(foo).constructor;
+var instance = AsyncFunction();
+
+assert.throws(TypeError, function() {
+  new instance();
+})
diff --git a/test/built-ins/AsyncFunction/instance-construct.js b/test/built-ins/AsyncFunction/instance-construct.js
deleted file mode 100644
index 00a9354ac..000000000
--- a/test/built-ins/AsyncFunction/instance-construct.js
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2016 Microsoft, Inc. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-author: Brian Terlson <brian.terlson@microsoft.com>
-esid: pending
-description: >
-  Async function instances are not constructors and do not have a
-  [[Construct]] slot.
----*/
-
-async function foo() { }
-assert.throws(TypeError, function() {
-  new foo();
-});
-
diff --git a/test/built-ins/GeneratorFunction/instance-construct-throws.js b/test/built-ins/GeneratorFunction/instance-construct-throws.js
new file mode 100644
index 000000000..fc22cb153
--- /dev/null
+++ b/test/built-ins/GeneratorFunction/instance-construct-throws.js
@@ -0,0 +1,29 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-generatorfunction
+description: The instance created by GeneratorFunction is not a constructor
+info: |
+    25.2.1.1 GeneratorFunction ( p1, p2, … , pn, body )
+
+    ...
+    3. Return ? CreateDynamicFunction(C, NewTarget, "generator", args).
+
+    19.2.1.1.1 Runtime Semantics: CreateDynamicFunction( constructor, newTarget, kind, args )
+
+    ...
+    34. If kind is "generator", then
+        a. Let prototype be ObjectCreate(%GeneratorPrototype%).
+        b. Perform DefinePropertyOrThrow(F, "prototype", PropertyDescriptor{[[Value]]: prototype,
+            [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: false}).
+    ...
+---*/
+
+var GeneratorFunction = Object.getPrototypeOf(function* () {}).constructor;
+
+var instance = GeneratorFunction();
+
+assert.throws(TypeError, function() {
+    new instance();
+})