LibJS: Implement Temporal.PlainMonthDay.prototype.with/equals

Author: https://github.com/trflynn89
Commit: 5389acc231
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2471

Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.equals.js

@@ -0,0 +1,14 @@
+describe("correct behavior", () => {
+    test("length is 1", () => {
+        expect(Temporal.PlainMonthDay.prototype.equals).toHaveLength(1);
+    });
+
+    test("basic functionality", () => {
+        const firstPlainMonthDay = new Temporal.PlainMonthDay(2, 1, "iso8601");
+        const secondPlainMonthDay = new Temporal.PlainMonthDay(1, 1, "iso8601");
+        expect(firstPlainMonthDay.equals(firstPlainMonthDay)).toBeTrue();
+        expect(secondPlainMonthDay.equals(secondPlainMonthDay)).toBeTrue();
+        expect(firstPlainMonthDay.equals(secondPlainMonthDay)).toBeFalse();
+        expect(secondPlainMonthDay.equals(firstPlainMonthDay)).toBeFalse();
+    });
+});

Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.prototype.with.js

@@ -0,0 +1,57 @@
+describe("correct behavior", () => {
+    test("length is 1", () => {
+        expect(Temporal.PlainMonthDay.prototype.with).toHaveLength(1);
+    });
+
+    test("basic functionality", () => {
+        const plainMonthDay = new Temporal.PlainMonthDay(1, 1);
+        const values = [
+            [{ monthCode: "M07" }, new Temporal.PlainMonthDay(7, 1)],
+            [{ monthCode: "M07", day: 6 }, new Temporal.PlainMonthDay(7, 6)],
+            [{ year: 0, month: 7, day: 6 }, new Temporal.PlainMonthDay(7, 6)],
+        ];
+        for (const [arg, expected] of values) {
+            expect(plainMonthDay.with(arg).equals(expected)).toBeTrue();
+        }
+
+        // Supplying the same values doesn't change the month/day, but still creates a new object
+        const plainMonthDayLike = {
+            month: plainMonthDay.month,
+            day: plainMonthDay.day,
+        };
+        expect(plainMonthDay.with(plainMonthDayLike)).not.toBe(plainMonthDay);
+        expect(plainMonthDay.with(plainMonthDayLike).equals(plainMonthDay)).toBeTrue();
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainMonthDay object", () => {
+        expect(() => {
+            Temporal.PlainMonthDay.prototype.with.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainMonthDay");
+    });
+
+    test("argument must be an object", () => {
+        expect(() => {
+            new Temporal.PlainMonthDay(1, 1).with("foo");
+        }).toThrowWithMessage(TypeError, "Object must be a partial Temporal object");
+        expect(() => {
+            new Temporal.PlainMonthDay(1, 1).with(42);
+        }).toThrowWithMessage(TypeError, "Object must be a partial Temporal object");
+    });
+
+    test("argument must have at least one Temporal property", () => {
+        expect(() => {
+            new Temporal.PlainMonthDay(1, 1).with({});
+        }).toThrowWithMessage(TypeError, "Object must be a partial Temporal object");
+    });
+
+    test("argument must not have 'calendar' or 'timeZone'", () => {
+        expect(() => {
+            new Temporal.PlainMonthDay(1, 1).with({ calendar: {} });
+        }).toThrowWithMessage(TypeError, "Object must be a partial Temporal object");
+        expect(() => {
+            new Temporal.PlainMonthDay(1, 1).with({ timeZone: {} });
+        }).toThrowWithMessage(TypeError, "Object must be a partial Temporal object");
+    });
+});