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LibJS: Implement Temporal.Duration.prototype.with()
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const DURATION_PROPERTIES = [
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"years",
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"months",
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"weeks",
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"days",
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"hours",
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"minutes",
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"seconds",
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"milliseconds",
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"microseconds",
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"nanoseconds",
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];
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.Duration.prototype.with).toHaveLength(1);
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});
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test("basic functionality", () => {
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const duration = new Temporal.Duration(1, 2, 3).with({ years: 4, foo: 5, weeks: 6 });
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expect(duration.years).toBe(4);
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expect(duration.months).toBe(2);
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expect(duration.weeks).toBe(6);
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});
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test("each property is looked up from the object", () => {
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for (const property of DURATION_PROPERTIES) {
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const duration = new Temporal.Duration().with({ [property]: 1 });
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expect(duration[property]).toBe(1);
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}
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});
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test("each property is coerced to number", () => {
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for (const property of DURATION_PROPERTIES) {
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const duration = new Temporal.Duration().with({ [property]: "1" });
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expect(duration[property]).toBe(1);
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}
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});
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});
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test("errors", () => {
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test("this value must be a Temporal.Duration object", () => {
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expect(() => {
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Temporal.Duration.prototype.with.call("foo");
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}).toThrowWithMessage(TypeError, "Not a Temporal.Duration");
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});
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test("argument is not an object", () => {
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expect(() => {
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new Temporal.Duration().with("foo");
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}).toThrowWithMessage(TypeError, "foo is not an object");
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expect(() => {
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new Temporal.Duration().with(42);
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}).toThrowWithMessage(TypeError, "42 is not an object");
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});
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test("argument is an invalid duration-like object", () => {
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expect(() => {
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new Temporal.Duration().with({});
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}).toThrowWithMessage(TypeError, "Invalid duration-like object");
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expect(() => {
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new Temporal.Duration().with({ foo: 1, bar: 2 });
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}).toThrowWithMessage(TypeError, "Invalid duration-like object");
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});
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test("error when coercing property to number", () => {
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for (const property of DURATION_PROPERTIES) {
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expect(() => {
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new Temporal.Duration().with({
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[property]: {
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valueOf() {
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throw new Error();
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},
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},
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});
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}).toThrow(Error);
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}
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});
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test("invalid duration value", () => {
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for (const property of DURATION_PROPERTIES) {
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expect(() => {
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new Temporal.Duration().with({ [property]: Infinity });
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}).toThrowWithMessage(RangeError, "Invalid duration");
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}
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});
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});
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