1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/prototype/isPrototypeOf/this-value-is-in-prototype-chain-of-arg.js b/js/src/tests/test262/built-ins/Object/prototype/isPrototypeOf/this-value-is-in-prototype-chain-of-arg.js
new file mode 100644
index 0000000000..fe5773032a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/prototype/isPrototypeOf/this-value-is-in-prototype-chain-of-arg.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-object.prototype.isprototypeof
+description: >
+  Object.prototype.isPrototypeOf returns true if either parameter V
+  and O refer to the same object or O is in [[Prototype]] chain of V.
+info: |
+  Object.prototype.isPrototypeOf ( V )
+
+  ...
+  3. Repeat,
+    a. Set V to ? V.[[GetPrototypeOf]]().
+    b. If V is null, return false.
+    c. If SameValue(O, V) is true, return true.
+---*/
+
+function USER_FACTORY(name) {
+  this.name = name;
+  this.getName = function() {
+    return name;
+  };
+}
+
+function FORCEDUSER_FACTORY(name, grade) {
+  this.name = name;
+  this.grade = grade;
+  this.getGrade = function() {
+    return grade;
+  };
+}
+
+var proto = new USER_FACTORY("noname");
+
+FORCEDUSER_FACTORY.prototype = proto;
+
+var luke = new FORCEDUSER_FACTORY("Luke Skywalker", 12);
+
+assert.sameValue(proto.isPrototypeOf(luke), true);
+assert.sameValue(USER_FACTORY.prototype.isPrototypeOf(luke), true);
+assert.sameValue(Number.isPrototypeOf(luke), false);
+
+reportCompare(0, 0);