1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/GeneratorFunction/instance-length.js b/js/src/tests/test262/built-ins/GeneratorFunction/instance-length.js
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index 0000000000..3af90cc37b
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+++ b/js/src/tests/test262/built-ins/GeneratorFunction/instance-length.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-generatorfunction
+description: Definition of instance `length` property
+info: |
+    [...]
+    3. Return CreateDynamicFunction(C, NewTarget, "generator", args).
+
+    19.2.1.1.1 Runtime Semantics: CreateDynamicFunction
+
+    [...]
+    26. Perform FunctionInitialize(F, Normal, parameters, body, scope).
+    [...]
+
+    9.2.4 FunctionInitialize
+
+    [...]
+    3. Perform ! DefinePropertyOrThrow(F, "length",
+       PropertyDescriptor{[[Value]]: len, [[Writable]]: false, [[Enumerable]]:
+       false, [[Configurable]]: true}).
+    [...]
+includes: [propertyHelper.js]
+features: [generators]
+---*/
+
+var GeneratorFunction = Object.getPrototypeOf(function*() {}).constructor;
+
+assert.sameValue(GeneratorFunction().length, 0);
+assert.sameValue(GeneratorFunction('').length, 0);
+assert.sameValue(GeneratorFunction('x').length, 0);
+assert.sameValue(GeneratorFunction('x', '').length, 1);
+assert.sameValue(GeneratorFunction('x', 'y', '').length, 2);
+assert.sameValue(GeneratorFunction('x, y', '').length, 2);
+
+verifyNotEnumerable(GeneratorFunction(), 'length');
+verifyNotWritable(GeneratorFunction(), 'length');
+verifyConfigurable(GeneratorFunction(), 'length');
+
+reportCompare(0, 0);