LibJS: Implement Temporal.ZonedDateTime.prototype.startOfDay

1 files changed, 45 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.startOfDay.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.startOfDay.js
new file mode 100644
index 0000000000..d95402e5e0
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/ZonedDateTime/ZonedDateTime.prototype.startOfDay.js
@@ -0,0 +1,45 @@
+describe("correct behavior", () => {
+    test("length is 0", () => {
+        expect(Temporal.ZonedDateTime.prototype.startOfDay).toHaveLength(0);
+    });
+
+    test("basic functionality", () => {
+        const plainDateTime = new Temporal.PlainDateTime(2021, 11, 3, 20, 9, 45, 100, 200, 300);
+        const timeZone = new Temporal.TimeZone("UTC");
+        const zonedDateTime = plainDateTime.toZonedDateTime(timeZone);
+        const startOfDayZonedDateTime = zonedDateTime.startOfDay();
+
+        expect(startOfDayZonedDateTime.epochNanoseconds).toBe(1635897600000000000n);
+        expect(startOfDayZonedDateTime.epochMicroseconds).toBe(1635897600000000n);
+        expect(startOfDayZonedDateTime.epochMilliseconds).toBe(1635897600000);
+        expect(startOfDayZonedDateTime.epochSeconds).toBe(1635897600);
+        expect(startOfDayZonedDateTime.year).toBe(2021);
+        expect(startOfDayZonedDateTime.month).toBe(11);
+        expect(startOfDayZonedDateTime.monthCode).toBe("M11");
+        expect(startOfDayZonedDateTime.day).toBe(3);
+        expect(startOfDayZonedDateTime.hour).toBe(0);
+        expect(startOfDayZonedDateTime.minute).toBe(0);
+        expect(startOfDayZonedDateTime.second).toBe(0);
+        expect(startOfDayZonedDateTime.millisecond).toBe(0);
+        expect(startOfDayZonedDateTime.microsecond).toBe(0);
+        expect(startOfDayZonedDateTime.nanosecond).toBe(0);
+        expect(startOfDayZonedDateTime.dayOfWeek).toBe(3);
+        expect(startOfDayZonedDateTime.dayOfYear).toBe(307);
+        expect(startOfDayZonedDateTime.weekOfYear).toBe(44);
+        expect(startOfDayZonedDateTime.hoursInDay).toBe(24);
+        expect(startOfDayZonedDateTime.daysInWeek).toBe(7);
+        expect(startOfDayZonedDateTime.daysInYear).toBe(365);
+        expect(startOfDayZonedDateTime.monthsInYear).toBe(12);
+        expect(startOfDayZonedDateTime.inLeapYear).toBeFalse();
+        expect(startOfDayZonedDateTime.offset).toBe("+00:00");
+        expect(startOfDayZonedDateTime.offsetNanoseconds).toBe(0);
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.ZonedDateTime object", () => {
+        expect(() => {
+            Temporal.ZonedDateTime.prototype.startOfDay.call("foo");
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.ZonedDateTime");
+    });
+});