LibJS: Implement Temporal.PlainTime.prototype.toZonedDateTime()

Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.toZonedDateTime.js

@@ -0,0 +1,55 @@
+describe("correct behavior", () => {
+    test("length is 1", () => {
+        expect(Temporal.PlainTime.prototype.toZonedDateTime).toHaveLength(1);
+    });
+
+    test("basic functionality", () => {
+        const plainTime = new Temporal.PlainTime(18, 14, 47, 123, 456, 789);
+        const plainDate = new Temporal.PlainDate(2021, 7, 6);
+        const timeZone = new Temporal.TimeZone("UTC");
+        const zonedDateTime = plainTime.toZonedDateTime({ plainDate, timeZone });
+        expect(zonedDateTime.year).toBe(2021);
+        expect(zonedDateTime.month).toBe(7);
+        expect(zonedDateTime.day).toBe(6);
+        expect(zonedDateTime.hour).toBe(18);
+        expect(zonedDateTime.minute).toBe(14);
+        expect(zonedDateTime.second).toBe(47);
+        expect(zonedDateTime.millisecond).toBe(123);
+        expect(zonedDateTime.microsecond).toBe(456);
+        expect(zonedDateTime.nanosecond).toBe(789);
+        expect(zonedDateTime.calendar).toBe(plainDate.calendar);
+        expect(zonedDateTime.timeZone).toBe(timeZone);
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainTime object", () => {
+        expect(() => {
+            Temporal.PlainTime.prototype.toZonedDateTime.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainTime");
+    });
+
+    test("item argument must be an object", () => {
+        const plainTime = new Temporal.PlainTime();
+        for (const value of [123, NaN, Infinity, true, false, null, undefined]) {
+            expect(() => {
+                plainTime.toZonedDateTime(value);
+            }).toThrowWithMessage(TypeError, `${value} is not an object`);
+        }
+    });
+
+    test("item argument must have a 'plainDate' property", () => {
+        const plainTime = new Temporal.PlainTime();
+        expect(() => {
+            plainTime.toZonedDateTime({});
+        }).toThrowWithMessage(TypeError, "Required property plainDate is missing or undefined");
+    });
+
+    test("item argument must have a 'timeZone' property", () => {
+        const plainDate = new Temporal.PlainDate(1970, 1, 1);
+        const plainTime = new Temporal.PlainTime();
+        expect(() => {
+            plainTime.toZonedDateTime({ plainDate });
+        }).toThrowWithMessage(TypeError, "Required property timeZone is missing or undefined");
+    });
+});