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diff --git a/js/src/tests/ecma_2/extensions/instanceof-001.js b/js/src/tests/ecma_2/extensions/instanceof-001.js
new file mode 100644
index 000000000..69aab1bfa
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+++ b/js/src/tests/ecma_2/extensions/instanceof-001.js
@@ -0,0 +1,111 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+ *  File Name:          instanceof-001.js
+ *  ECMA Section:       11.8.6
+ *  Description:
+ *
+ *  RelationalExpression instanceof Identifier
+ *
+ *  Author:             christine@netscape.com
+ *  Date:               2 September 1998
+ */
+var SECTION = "instanceof-001";
+var VERSION = "ECMA_2";
+var TITLE   = "instanceof"
+
+  startTest();
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+function InstanceOf( object_1, object_2, expect ) {
+  result = object_1 instanceof object_2;
+
+  new TestCase(
+    SECTION,
+    "(" + object_1 + ") instanceof " + object_2,
+    expect,
+    result );
+}
+
+function Gen3(value) {
+  this.value = value;
+  this.generation = 3;
+  this.toString = new Function ( "return \"(Gen\"+this.generation+\" instance)\"" );
+}
+Gen3.name = 3;
+Gen3.__proto__.toString = new Function( "return \"(\"+this.name+\" object)\"");
+
+function Gen2(value) {
+  this.value = value;
+  this.generation = 2;
+}
+Gen2.name = 2;
+Gen2.prototype = new Gen3();
+
+function Gen1(value) {
+  this.value = value;
+  this.generation = 1;
+}
+Gen1.name = 1;
+Gen1.prototype = new Gen2();
+
+function Gen0(value) {
+  this.value = value;
+  this.generation = 0;
+}
+Gen0.name = 0;
+Gen0.prototype = new Gen1();
+
+
+function GenA(value) {
+  this.value = value;
+  this.generation = "A";
+  this.toString = new Function ( "return \"(instance of Gen\"+this.generation+\")\"" );
+
+}
+GenA.prototype = new Gen0();
+GenA.name = "A";
+
+function GenB(value) {
+  this.value = value;
+  this.generation = "B";
+  this.toString = new Function ( "return \"(instance of Gen\"+this.generation+\")\"" );
+}
+GenB.name = "B"
+  GenB.prototype = void 0;
+
+// RelationalExpression is not an object.
+
+InstanceOf( true, Boolean, false );
+InstanceOf( new Boolean(false), Boolean, true );
+
+// __proto__ of RelationalExpression is null.  should return false
+genA = new GenA();
+genA.__proto__ = null;
+
+InstanceOf( genA, GenA, false );
+
+// RelationalExpression.__proto__ ==  (but not ===) Identifier.prototype
+
+InstanceOf( new Gen2(), Gen0, false );
+InstanceOf( new Gen2(), Gen1, false );
+InstanceOf( new Gen2(), Gen2, true );
+InstanceOf( new Gen2(), Gen3, true );
+
+// RelationalExpression.__proto__.__proto__ === Identifier.prototype
+InstanceOf( new Gen0(), Gen0, true );
+InstanceOf( new Gen0(), Gen1, true );
+InstanceOf( new Gen0(), Gen2, true );
+InstanceOf( new Gen0(), Gen3, true );
+
+InstanceOf( new Gen0(), Object, true );
+InstanceOf( new Gen0(), Function, false );
+
+InstanceOf( Gen0, Function, true );
+InstanceOf( Gen0, Object, true );
+
+test();