michael@0: function testUndefinedBooleanCmp()
michael@0: {
michael@0:     var t = true, f = false, x = [];
michael@0:     for (var i = 0; i < 10; ++i) {
michael@0:         x[0] = t == undefined;
michael@0:         x[1] = t != undefined;
michael@0:         x[2] = t === undefined;
michael@0:         x[3] = t !== undefined;
michael@0:         x[4] = t < undefined;
michael@0:         x[5] = t > undefined;
michael@0:         x[6] = t <= undefined;
michael@0:         x[7] = t >= undefined;
michael@0:         x[8] = f == undefined;
michael@0:         x[9] = f != undefined;
michael@0:         x[10] = f === undefined;
michael@0:         x[11] = f !== undefined;
michael@0:         x[12] = f < undefined;
michael@0:         x[13] = f > undefined;
michael@0:         x[14] = f <= undefined;
michael@0:         x[15] = f >= undefined;
michael@0:     }
michael@0:     return x.join(",");
michael@0: }
michael@0: assertEq(testUndefinedBooleanCmp(), "false,true,false,true,false,false,false,false,false,true,false,true,false,false,false,false");