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LibJS: Implement ECMA-402 Date.prototype.toLocaleDateString
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2 changed files with 75 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.toLocaleDateString();
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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).toLocaleDateString();
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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expect(() => {
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new Date(1n).toLocaleDateString();
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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).toLocaleDateString();
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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("timeStyle may not be specified", () => {
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expect(() => {
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new Date().toLocaleDateString([], { timeStyle: "short" });
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}).toThrowWithMessage(TypeError, "Option timeStyle cannot be set when also providing date");
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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.toLocaleDateString()).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 date", () => {
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expect(d0.toLocaleDateString("en")).toBe("12/7/2021");
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expect(d1.toLocaleDateString("en")).toBe("1/23/1989");
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expect(d0.toLocaleDateString("ar")).toBe("٧/١٢/٢٠٢١");
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expect(d1.toLocaleDateString("ar")).toBe("٢٣/١/١٩٨٩");
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});
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test("dateStyle may be set", () => {
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expect(d0.toLocaleDateString("en", { dateStyle: "full" })).toBe(
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"Tuesday, December 7, 2021"
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);
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expect(d1.toLocaleDateString("en", { dateStyle: "full" })).toBe("Monday, January 23, 1989");
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expect(d0.toLocaleDateString("ar", { dateStyle: "full" })).toBe("الثلاثاء، ٧ ديسمبر ٢٠٢١");
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expect(d1.toLocaleDateString("ar", { dateStyle: "full" })).toBe("الاثنين، ٢٣ يناير ١٩٨٩");
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});
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});
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