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LibJS: Implement Temporal.PlainYearMonth.prototype.with()
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.PlainYearMonth.prototype.with).toHaveLength(1);
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});
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test("basic functionality", () => {
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const plainYearMonth = new Temporal.PlainYearMonth(1970, 1);
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const values = [
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[{ year: 2021 }, new Temporal.PlainYearMonth(2021, 1)],
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[{ year: 2021, month: 7 }, new Temporal.PlainYearMonth(2021, 7)],
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[{ year: 2021, monthCode: "M07" }, new Temporal.PlainYearMonth(2021, 7)],
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];
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for (const [arg, expected] of values) {
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expect(plainYearMonth.with(arg).equals(expected)).toBeTrue();
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}
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// Supplying the same values doesn't change the year/month, but still creates a new object
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const plainYearMonthLike = { year: plainYearMonth.year, month: plainYearMonth.month };
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expect(plainYearMonth.with(plainYearMonthLike)).not.toBe(plainYearMonth);
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expect(plainYearMonth.with(plainYearMonthLike).equals(plainYearMonth)).toBeTrue();
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});
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});
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describe("errors", () => {
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test("this value must be a Temporal.PlainYearMonth object", () => {
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expect(() => {
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Temporal.PlainYearMonth.prototype.with.call("foo");
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}).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainYearMonth");
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});
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test("argument must be an object", () => {
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expect(() => {
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new Temporal.PlainYearMonth(1970, 1).with("foo");
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}).toThrowWithMessage(TypeError, "foo is not an object");
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expect(() => {
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new Temporal.PlainYearMonth(1970, 1).with(42);
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}).toThrowWithMessage(TypeError, "42 is not an object");
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});
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test("argument must have one of 'month', 'monthCode', 'year'", () => {
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expect(() => {
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new Temporal.PlainYearMonth(1970, 1).with({});
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}).toThrowWithMessage(
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TypeError,
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"Object must have at least one of the following properties: month, monthCode, year"
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);
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});
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test("argument must not have 'calendar' or 'timeZone'", () => {
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expect(() => {
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new Temporal.PlainYearMonth(1970, 1).with({ calendar: {} });
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}).toThrowWithMessage(TypeError, "Object must not have a defined calendar property");
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expect(() => {
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new Temporal.PlainYearMonth(1970, 1).with({ timeZone: {} });
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}).toThrowWithMessage(TypeError, "Object must not have a defined timeZone property");
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});
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});
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