describe("correct behavior", () => {
    test("length is 1", () => {
        expect(Temporal.PlainMonthDay.from).toHaveLength(1);
    });

    test("PlainDate instance argument", () => {
        const plainDate = new Temporal.PlainDate(2021, 7, 6);
        const plainMonthDay = Temporal.PlainMonthDay.from(plainDate);
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("PlainMonthDay instance argument", () => {
        const plainMonthDay_ = new Temporal.PlainMonthDay(7, 6);
        const plainMonthDay = Temporal.PlainMonthDay.from(plainMonthDay_);
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("ZonedDateTime instance argument", () => {
        const timeZone = new Temporal.TimeZone("UTC");
        const zonedDateTime = new Temporal.ZonedDateTime(1625614921000000000n, timeZone);
        const plainMonthDay = Temporal.PlainMonthDay.from(zonedDateTime);
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("fields object argument", () => {
        const object = {
            month: 7,
            day: 6,
        };
        const plainMonthDay = Temporal.PlainMonthDay.from(object);
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("from month day string", () => {
        const plainMonthDay = Temporal.PlainMonthDay.from("--07-06");
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("from date time string", () => {
        const plainMonthDay = Temporal.PlainMonthDay.from("2021-07-06T23:42:01");
        expect(plainMonthDay.monthCode).toBe("M07");
        expect(plainMonthDay.day).toBe(6);
    });

    test("compares calendar name in month day string in lowercase", () => {
        const values = [
            "02-10[u-ca=iso8601]",
            "02-10[u-ca=isO8601]",
            "02-10[u-ca=iSo8601]",
            "02-10[u-ca=iSO8601]",
            "02-10[u-ca=Iso8601]",
            "02-10[u-ca=IsO8601]",
            "02-10[u-ca=ISo8601]",
            "02-10[u-ca=ISO8601]",
        ];

        for (const value of values) {
            expect(() => {
                Temporal.PlainMonthDay.from(value);
            }).not.toThrowWithMessage(
                RangeError,
                "MM-DD string format can only be used with the iso8601 calendar"
            );
        }
    });
});

describe("errors", () => {
    test("missing fields", () => {
        expect(() => {
            Temporal.PlainMonthDay.from({});
        }).toThrowWithMessage(TypeError, "Required property day is missing or undefined");
        expect(() => {
            Temporal.PlainMonthDay.from({ month: 1 });
        }).toThrowWithMessage(TypeError, "Required property day is missing or undefined");
        expect(() => {
            Temporal.PlainMonthDay.from({ day: 1 });
        }).toThrowWithMessage(TypeError, "Required property month is missing or undefined");
    });

    test("invalid month day string", () => {
        expect(() => {
            Temporal.PlainMonthDay.from("foo");
        }).toThrowWithMessage(RangeError, "Invalid month day string 'foo'");
    });

    test("string must not contain a UTC designator", () => {
        expect(() => {
            Temporal.PlainMonthDay.from("2021-07-06T23:42:01Z");
        }).toThrowWithMessage(
            RangeError,
            "Invalid month day string '2021-07-06T23:42:01Z': must not contain a UTC designator"
        );
    });

    test("extended year must not be negative zero", () => {
        expect(() => {
            Temporal.PlainMonthDay.from("-000000-01-01");
        }).toThrowWithMessage(RangeError, "Invalid month day string '-000000-01-01'");
        expect(() => {
            Temporal.PlainMonthDay.from("−000000-01-01"); // U+2212
        }).toThrowWithMessage(RangeError, "Invalid month day string '−000000-01-01'");
    });

    test("can only use iso8601 calendar with month day strings", () => {
        expect(() => {
            Temporal.PlainMonthDay.from("02-10[u-ca=iso8602]");
        }).toThrowWithMessage(
            RangeError,
            "MM-DD string format can only be used with the iso8601 calendar"
        );

        expect(() => {
            Temporal.PlainMonthDay.from("02-10[u-ca=SerenityOS]");
        }).toThrowWithMessage(
            RangeError,
            "MM-DD string format can only be used with the iso8601 calendar"
        );
    });

    test("doesn't throw non-iso8601 calendar error when using a superset format string such as DateTime", () => {
        // NOTE: This will still throw, but only because "serenity" is not a recognised calendar, not because of the string format restriction.
        try {
            Temporal.PlainMonthDay.from("2023-02-10T22:56[u-ca=serenity]");
        } catch (e) {
            expect(e).toBeInstanceOf(RangeError);
            expect(e.message).not.toBe(
                "MM-DD string format can only be used with the iso8601 calendar"
            );
            expect(e.message).toBe("Invalid calendar identifier 'serenity'");
        }
    });
});