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LibJS: Add Date.prototype.setDate()
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4 changed files with 73 additions and 0 deletions
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@ -0,0 +1,47 @@
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test("no arguments", () => {
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let date = new Date(2021, 0, 1);
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date.setDate();
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expect(date.getTime()).toBe(NaN);
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});
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test("NaN or undefined as only argument", () => {
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let date = new Date(2021, 0, 1);
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date.setDate(NaN);
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expect(date.getTime()).toBe(NaN);
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date = new Date(2021, 0, 1);
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date.setDate(undefined);
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expect(date.getTime()).toBe(NaN);
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date = new Date(2021, 0, 1);
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date.setDate("a");
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expect(date.getTime()).toBe(NaN);
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});
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test("Day as argument", () => {
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let date = new Date(2021, 0, 1);
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date.setDate(17);
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expect(date.getDate()).toBe(17);
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expect(date.getMonth()).toBe(0);
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expect(date.getFullYear()).toBe(2021);
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expect(date.getHours()).toBe(0);
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expect(date.getMinutes()).toBe(0);
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expect(date.getSeconds()).toBe(0);
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expect(date.getMilliseconds()).toBe(0);
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});
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test("Make Invalid Date valid again", () => {
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let date = new Date(2021, 0, 1);
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date.setDate(NaN);
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expect(date.getTime()).toBe(NaN);
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date.setDate(16);
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expect(date.getFullYear()).toBe(2021);
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expect(date.getMonth()).toBe(0);
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expect(date.getDate()).toBe(16);
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expect(date.getHours()).toBe(0);
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expect(date.getMinutes()).toBe(0);
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expect(date.getSeconds()).toBe(0);
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expect(date.getMilliseconds()).toBe(0);
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});
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