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 function testUndefinedBooleanCmp()

 {

     var t = true, f = false, x = [];

     for (var i = 0; i < 10; ++i) {

         x[0] = t == undefined;

         x[1] = t != undefined;

         x[2] = t === undefined;

         x[3] = t !== undefined;

         x[4] = t < undefined;

         x[5] = t > undefined;

         x[6] = t <= undefined;

         x[7] = t >= undefined;

         x[8] = f == undefined;

         x[9] = f != undefined;

         x[10] = f === undefined;

         x[11] = f !== undefined;

         x[12] = f < undefined;

         x[13] = f > undefined;

         x[14] = f <= undefined;

         x[15] = f >= undefined;

     }

     return x.join(",");

 }

 assertEq(testUndefinedBooleanCmp(), "false,true,false,true,false,false,false,false,false,true,false,true,false,false,false,false");