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LibJS: Implement Date.prototype.setUTCMilliseconds
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3 changed files with 72 additions and 4 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.setUTCMilliseconds();
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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().setUTCMilliseconds(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.setUTCMilliseconds(8);
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expect(d.getUTCMilliseconds()).toBe(8);
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d.setUTCMilliseconds("");
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expect(d.getUTCMilliseconds()).toBe(0);
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d.setUTCMilliseconds("a");
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expect(d.getUTCMilliseconds()).toBe(NaN);
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});
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test("NaN", () => {
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d.setUTCMilliseconds(NaN);
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expect(d.getUTCMilliseconds()).toBeNaN();
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});
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test("time clip", () => {
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d.setUTCMilliseconds(8.65e15);
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expect(d.getUTCMilliseconds()).toBeNaN();
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});
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});
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