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diff --git a/test/suite/ietestcenter/chapter15/15.4/15.4.4/15.4.4.20/15.4.4.20-6-8.js b/test/suite/ietestcenter/chapter15/15.4/15.4.4/15.4.4.20/15.4.4.20-6-8.js
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+/// Copyright (c) 2009 Microsoft Corporation 
+/// 
+/// Redistribution and use in source and binary forms, with or without modification, are permitted provided
+/// that the following conditions are met: 
+///    * Redistributions of source code must retain the above copyright notice, this list of conditions and
+///      the following disclaimer. 
+///    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 
+///      the following disclaimer in the documentation and/or other materials provided with the distribution.  
+///    * Neither the name of Microsoft nor the names of its contributors may be used to
+///      endorse or promote products derived from this software without specific prior written permission.
+/// 
+/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+/// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+/// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+/// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+/// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+/// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+/// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+/// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+
+
+
+ES5Harness.registerTest( {
+id: "15.4.4.20-6-8",
+
+path: "TestCases/chapter15/15.4/15.4.4/15.4.4.20/15.4.4.20-6-8.js",
+
+description: "Array.prototype.filter returns an empty array if 'length' is 0 (subclassed Array, length overridden with []",
+
+test: function testcase() {
+  foo.prototype = new Array(1, 2, 3);
+  function foo() {}
+  var f = new foo();
+  
+  f.length = [];
+  
+  // objects inherit the default valueOf method of the Object object;
+  // that simply returns the itself. Since the default valueOf() method
+  // does not return a primitive value, ES next tries to convert the object
+  // to a number by calling its toString() method and converting the
+  // resulting string to a number.
+  //
+  // The toString( ) method on Array converts the array elements to strings,
+  // then returns the result of concatenating these strings, with commas in
+  // between. An array with no elements converts to the empty string, which
+  // converts to the number 0. If an array has a single element that is a
+  // number n, the array converts to a string representation of n, which is
+  // then converted back to n itself. If an array contains more than one element,
+  // or if its one element is not a number, the array converts to NaN.
+
+  function cb(){}
+  var a = f.filter(cb);
+  
+  if (Array.isArray(a) &&
+      a.length === 0) {
+    return true;
+  }
+ },
+
+precondition: function prereq() {
+  return fnExists(Array.prototype.filter);
+ }
+});