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LibJS: Implement ECMA-402 Date.prototype.toLocaleTimeString
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2 changed files with 81 additions and 6 deletions
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describe("errors", () => {
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test("called on non-Date object", () => {
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expect(() => {
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Date.prototype.toLocaleTimeString();
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}).toThrowWithMessage(TypeError, "Not an object of type Date");
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});
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test("called with value that cannot be converted to a number", () => {
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expect(() => {
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new Date(Symbol.hasInstance).toLocaleTimeString();
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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expect(() => {
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new Date(1n).toLocaleTimeString();
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}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
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});
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test("time value cannot be clipped", () => {
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expect(() => {
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new Date(-8.65e15).toLocaleTimeString();
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}).toThrowWithMessage(RangeError, "Time value must be between -8.64E15 and 8.64E15");
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});
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test("dateStyle may not be specified", () => {
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expect(() => {
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new Date().toLocaleTimeString([], { dateStyle: "short" });
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}).toThrowWithMessage(TypeError, "Option dateStyle cannot be set when also providing time");
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});
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});
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describe("correct behavior", () => {
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test("NaN", () => {
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const d = new Date(NaN);
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expect(d.toLocaleTimeString()).toBe("Invalid Date");
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});
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const d0 = new Date(Date.UTC(2021, 11, 7, 17, 40, 50, 456));
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const d1 = new Date(Date.UTC(1989, 0, 23, 7, 8, 9, 45));
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test("defaults to time", () => {
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expect(d0.toLocaleTimeString("en", { timeZone: "UTC" })).toBe("5:40:50 PM");
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expect(d1.toLocaleTimeString("en", { timeZone: "UTC" })).toBe("7:08:09 AM");
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expect(d0.toLocaleTimeString("ar", { timeZone: "UTC" })).toBe("٥:٤٠:٥٠ م");
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expect(d1.toLocaleTimeString("ar", { timeZone: "UTC" })).toBe("٧:٠٨:٠٩ ص");
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});
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test("timeStyle may be set", () => {
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expect(d0.toLocaleTimeString("en", { timeStyle: "long", timeZone: "UTC" })).toBe(
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"5:40:50 PM UTC"
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);
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expect(d1.toLocaleTimeString("en", { timeStyle: "long", timeZone: "UTC" })).toBe(
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"7:08:09 AM UTC"
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);
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expect(d0.toLocaleTimeString("ar", { timeStyle: "long", timeZone: "UTC" })).toBe(
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"٥:٤٠:٥٠ م UTC"
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);
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expect(d1.toLocaleTimeString("ar", { timeStyle: "long", timeZone: "UTC" })).toBe(
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"٧:٠٨:٠٩ ص UTC"
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);
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});
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});
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