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