ca49f96b78
Setting an invalid value on a Date object now makes it invalid. Setting it again but with correct values makes it valid again.
89 lines
3.8 KiB
JavaScript
89 lines
3.8 KiB
JavaScript
test("basic functionality", () => {
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expect(Date).toHaveLength(7);
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expect(Date.name === "Date");
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expect(Date.prototype).not.toHaveProperty("length");
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});
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test("string constructor", () => {
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// The string constructor is the same as calling the timestamp constructor with the result of Date.parse(arguments).
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// Since that has exhaustive tests in Date.parse.js, just do some light smoke testing here.
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expect(new Date("2017-09-07T21:08:59.001Z").toISOString()).toBe("2017-09-07T21:08:59.001Z");
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});
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test("timestamp constructor", () => {
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// The timestamp constructor takes a timestamp in milliseconds since the start of the epoch, in UTC.
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// 50 days and 1234 milliseconds after the start of the epoch.
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// Most Date methods return values in local time, but since timezone offsets are less than 17 days,
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// these checks will pass in all timezones.
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let timestamp = 50 * 24 * 60 * 60 * 1000 + 1234;
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let date = new Date(timestamp);
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expect(date.getTime()).toBe(timestamp); // getTime() returns the timestamp in UTC.
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expect(date.getMilliseconds()).toBe(234);
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expect(date.getSeconds()).toBe(1);
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expect(date.getFullYear()).toBe(1970);
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expect(date.getMonth()).toBe(1); // Feb
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date = new Date(NaN);
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expect(date.getTime()).toBe(NaN);
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date = new Date(undefined);
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expect(date.getTime()).toBe(NaN);
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date = new Date("");
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expect(date.getTime()).toBe(NaN);
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});
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test("tuple constructor", () => {
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// The tuple constructor takes a date in local time.
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expect(new Date(2019, 11).getFullYear()).toBe(2019);
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expect(new Date(2019, 11).getMonth()).toBe(11);
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expect(new Date(2019, 11).getDate()).toBe(1); // getDay() returns day of week, getDate() returns day in month
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expect(new Date(2019, 11).getHours()).toBe(0);
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expect(new Date(2019, 11).getMinutes()).toBe(0);
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expect(new Date(2019, 11).getSeconds()).toBe(0);
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expect(new Date(2019, 11).getMilliseconds()).toBe(0);
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expect(new Date(2019, 11).getDay()).toBe(0);
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let date = new Date(2019, 11, 15, 9, 16, 14, 123); // Note: Month is 0-based.
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expect(date.getFullYear()).toBe(2019);
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expect(date.getMonth()).toBe(11);
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expect(date.getDate()).toBe(15);
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expect(date.getHours()).toBe(9);
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expect(date.getMinutes()).toBe(16);
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expect(date.getSeconds()).toBe(14);
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expect(date.getMilliseconds()).toBe(123);
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expect(date.getDay()).toBe(0);
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// getTime() returns a time stamp in UTC, but we can at least check it's in the right interval, which will be true independent of the local timezone if the range is big enough.
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let timestamp_lower_bound = 1575072000000; // 2019-12-01T00:00:00Z
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let timestamp_upper_bound = 1577750400000; // 2019-12-31T00:00:00Z
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expect(date.getTime()).toBeGreaterThan(timestamp_lower_bound);
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expect(date.getTime()).toBeLessThan(timestamp_upper_bound);
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date = new Date(NaN, 11, 15, 9, 16, 14, 123);
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expect(date.getTime()).toBe(NaN);
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date = new Date(2021, 11, 15, 9, 16, 14, undefined);
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expect(date.getTime()).toBe(NaN);
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});
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test("tuple constructor overflow", () => {
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let date = new Date(2019, 13, 33, 30, 70, 80, 2345);
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expect(date.getFullYear()).toBe(2020);
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expect(date.getMonth()).toBe(2);
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expect(date.getDate()).toBe(5);
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expect(date.getHours()).toBe(7);
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expect(date.getMinutes()).toBe(11);
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expect(date.getSeconds()).toBe(22);
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expect(date.getMilliseconds()).toBe(345);
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expect(date.getDay()).toBe(4);
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date = new Date(2019, -13, -33, -30, -70, -80, -2345);
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expect(date.getFullYear()).toBe(2017);
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expect(date.getMonth()).toBe(9);
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expect(date.getDate()).toBe(26);
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expect(date.getHours()).toBe(16);
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expect(date.getMinutes()).toBe(48);
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expect(date.getSeconds()).toBe(37);
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expect(date.getMilliseconds()).toBe(655);
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expect(date.getDay()).toBe(4);
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});
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