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

Fixes #779
This commit is contained in:
Leo Balter 2017-03-15 17:12:54 -04:00 committed by GitHub
parent e4bbdba105
commit 2f11b4d806
3 changed files with 67 additions and 16 deletions
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38
test/built-ins/AsyncFunction/instance-construct-throws.js Normal file
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// 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();
})

16
test/built-ins/AsyncFunction/instance-construct.js
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// 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();
});

29
test/built-ins/GeneratorFunction/instance-construct-throws.js Normal file
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// 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();
})