1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/NumberFormat/prototype/format/format-function-builtin.js b/js/src/tests/test262/intl402/NumberFormat/prototype/format/format-function-builtin.js
new file mode 100644
index 0000000000..55f0ce7dd5
--- /dev/null
+++ b/js/src/tests/test262/intl402/NumberFormat/prototype/format/format-function-builtin.js
@@ -0,0 +1,33 @@
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+es5id: 11.3.2_1_a_L15
+description: >
+    Tests that the function returned by
+    Intl.NumberFormat.prototype.format meets the requirements for
+    built-in objects defined by the introduction of chapter 17 of the
+    ECMAScript Language Specification.
+author: Norbert Lindenberg
+includes: [isConstructor.js]
+features: [Reflect.construct]
+---*/
+
+var formatFn = new Intl.NumberFormat().format;
+
+assert.sameValue(Object.prototype.toString.call(formatFn), "[object Function]",
+                 "The [[Class]] internal property of a built-in function must be " +
+                 "\"Function\".");
+
+assert(Object.isExtensible(formatFn),
+       "Built-in objects must be extensible.");
+
+assert.sameValue(Object.getPrototypeOf(formatFn), Function.prototype);
+
+assert.sameValue(formatFn.hasOwnProperty("prototype"), false,
+                 "Built-in functions that aren't constructors must not have a prototype property.");
+
+assert.sameValue(isConstructor(formatFn), false,
+                 "Built-in functions don't implement [[Construct]] unless explicitly specified.");
+
+reportCompare(0, 0);