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LibJS: Implement Date.prototype.setUTCFullYear
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3 changed files with 93 additions and 2 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.setUTCFullYear();
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}).toThrowWithMessage(TypeError, "Not an object of type Date");
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});
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test("called with non-numeric parameters", () => {
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expect(() => {
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new Date().setUTCFullYear(Symbol.hasInstance);
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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expect(() => {
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new Date().setUTCFullYear(1989, Symbol.hasInstance);
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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expect(() => {
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new Date().setUTCFullYear(1989, 0, Symbol.hasInstance);
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
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});
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});
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describe("correct behavior", () => {
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const d = new Date(2000, 2, 1);
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test("basic functionality", () => {
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d.setUTCFullYear(1989);
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expect(d.getUTCFullYear()).toBe(1989);
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d.setUTCFullYear(1990, 1);
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expect(d.getUTCFullYear()).toBe(1990);
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expect(d.getUTCMonth()).toBe(1);
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d.setUTCFullYear(1991, 2, 15);
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expect(d.getUTCFullYear()).toBe(1991);
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expect(d.getUTCMonth()).toBe(2);
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expect(d.getUTCDate()).toBe(15);
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d.setUTCFullYear("");
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expect(d.getUTCFullYear()).toBe(0);
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d.setUTCFullYear("a");
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expect(d.getUTCFullYear()).toBe(NaN);
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});
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test("NaN", () => {
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d.setUTCFullYear(NaN);
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expect(d.getUTCFullYear()).toBeNaN();
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});
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test("time clip", () => {
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d.setUTCFullYear(8.65e15);
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expect(d.getUTCFullYear()).toBeNaN();
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});
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});
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