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function testNaN(x) {
var x = NaN;
assertEq(isNaN(x), true);
}
testNaN();
function testInfinity(x) {
return (x === Infinity);
}
assertEq(testInfinity(Infinity), true);
assertEq(testInfinity(6), false);
assertEq(testInfinity(-Infinity), false);
function testUndefined(x) {
return (x === undefined);
}
assertEq(testUndefined(undefined), true);
assertEq(testUndefined(), true);
assertEq(testUndefined(5), false);