LibJS: Implement Temporal.Instant.prototype.epochMilliseconds

Author: https://github.com/linusg Commit: b157ab3f12 Pull-request: https://github.com/SerenityOS/serenity/pull/8568 Reviewed-by: https://github.com/IdanHo Reviewed-by: https://github.com/bgianfo ✅
2025-09-15 14:02:20 +00:00 · 2021-07-08 21:56:03 +01:00 · 2021-07-08 21:56:03 +01:00 · b157ab3f12 · 2024-07-18 10:02:39 +09:00
commit b157ab3f12
parent 5010e01223
4 changed files with 55 additions and 0 deletions
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/Instant/Instant.prototype.epochMilliseconds.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/Instant/Instant.prototype.epochMilliseconds.js
@ -0,0 +1,33 @@
+describe("correct behavior", () => {
+    test("basic functionality", () => {
+        expect(new Temporal.Instant(0n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(1n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(999_999n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(1_000_000n).epochMilliseconds).toBe(1);
+        expect(new Temporal.Instant(1_500_000n).epochMilliseconds).toBe(1);
+        expect(new Temporal.Instant(1_999_999n).epochMilliseconds).toBe(1);
+        expect(new Temporal.Instant(2_000_000n).epochMilliseconds).toBe(2);
+        expect(new Temporal.Instant(8_640_000_000_000_000_000_000n).epochMilliseconds).toBe(
+            8_640_000_000_000_000
+        );
+
+        expect(new Temporal.Instant(-0n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(-1n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(-999_999n).epochMilliseconds).toBe(0);
+        expect(new Temporal.Instant(-1_000_000n).epochMilliseconds).toBe(-1);
+        expect(new Temporal.Instant(-1_500_000n).epochMilliseconds).toBe(-1);
+        expect(new Temporal.Instant(-1_999_999n).epochMilliseconds).toBe(-1);
+        expect(new Temporal.Instant(-2_000_000n).epochMilliseconds).toBe(-2);
+        expect(new Temporal.Instant(-8_640_000_000_000_000_000_000n).epochMilliseconds).toBe(
+            -8_640_000_000_000_000
+        );
+    });
+});
+
+test("errors", () => {
+    test("this value must be a Temporal.Instant object", () => {
+        expect(() => {
+            Reflect.get(Temporal.Instant.prototype, "epochMilliseconds", "foo");
+        }).toThrowWithMessage(TypeError, "Not a Temporal.Instant");
+    });
+});