ECMAScript Date range unit test

datetest.js

try{

module("ES5 ranges");

test("ES5 Epoch", function() {

	// epoch
	var expected = 0;
	var actual = new Date(expected);

	same(actual.getTime(), expected, "");
	same(actual.getUTCFullYear(), 1970, "");
	same(actual.getUTCMonth(), 0, "");
	same(actual.getUTCDate(), 1, "");
	same(actual.getUTCHours(), 0, "");
	same(actual.getUTCMinutes(), 0, "");
	same(actual.getUTCSeconds(), 0, "");
	same(actual.getUTCMilliseconds(), 0, "");
});

test("ES5 Min Date", function() {

	// epoch - 1e8 days
	var expected = -8.64e15;
	var actual = new Date(expected);

	same(actual.getTime(), expected, "");
	same(actual.getUTCFullYear(), -271821, "");
	same(actual.getUTCMonth(), 3, "");
	same(actual.getUTCDate(), 20, "");
	same(actual.getUTCHours(), 0, "");
	same(actual.getUTCMinutes(), 0, "");
	same(actual.getUTCSeconds(), 0, "");
	same(actual.getUTCMilliseconds(), 0, "");
});

test("ES5 Max Date", function() {

	// epoch + 1e8 days
	var expected = 8.64e15;
	var actual = new Date(expected);

	same(actual.getTime(), expected, "");
	same(actual.getUTCFullYear(), 275760, "");
	same(actual.getUTCMonth(), 8, "");
	same(actual.getUTCDate(), 13, "");
	same(actual.getUTCHours(), 0, "");
	same(actual.getUTCMinutes(), 0, "");
	same(actual.getUTCSeconds(), 0, "");
	same(actual.getUTCMilliseconds(), 0, "");
});

module("Overflow Date ranges");

test("Underflow Date", function() {

	// epoch - 1e8 days - 1 ms
	var expected = -8.64e15-1;
	var actual = new Date(expected);

	same(actual.getTime(), NaN, "");
	same(actual.getUTCFullYear(), NaN, "");
	same(actual.getUTCMonth(), NaN, "");
	same(actual.getUTCDate(), NaN, "");
	same(actual.getUTCHours(), NaN, "");
	same(actual.getUTCMinutes(), NaN, "");
	same(actual.getUTCSeconds(), NaN, "");
	same(actual.getUTCMilliseconds(), NaN, "");
});

test("Overflow Date", function() {

	// epoch + 1e8 days + 1 ms
	var expected = 8.64e15+1;
	var actual = new Date(expected);

	same(actual.getTime(), NaN, "");
	same(actual.getUTCFullYear(), NaN, "");
	same(actual.getUTCMonth(), NaN, "");
	same(actual.getUTCDate(), NaN, "");
	same(actual.getUTCHours(), NaN, "");
	same(actual.getUTCMinutes(), NaN, "");
	same(actual.getUTCSeconds(), NaN, "");
	same(actual.getUTCMilliseconds(), NaN, "");
});


}catch(ex){alert(ex);}