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LibJS: Implement Date.prototype.getTimezoneOffset
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2 changed files with 36 additions and 4 deletions
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@ -0,0 +1,30 @@
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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.getTimezoneOffset();
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}).toThrowWithMessage(TypeError, "Not an object of type 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.getTimezoneOffset()).toBeNaN();
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});
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test("time clip", () => {
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const d = new Date(-8.65e15);
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expect(d.getTimezoneOffset()).toBeNaN();
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});
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test("basic functionality", () => {
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// Exact return values from getTimezoneOffset depend on the time zone of the host machine.
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// So we can't test exact values, but that value should not change here.
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const d0 = new Date(Date.parse("1989-01-23T14:30-00:00"));
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const d1 = new Date(Date.parse("1989-01-23T14:30-05:00"));
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const offset0 = d0.getTimezoneOffset();
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const offset1 = d1.getTimezoneOffset();
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expect(offset0).toBe(offset1);
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});
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});
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