From e31b8274f6fcf1ab4a66e873f2baa7056197ff3f Mon Sep 17 00:00:00 2001
From: Joseph Garrone <joseph.garrone.gj@gmail.com>
Date: Mon, 25 Nov 2024 15:35:19 +0100
Subject: [PATCH] Make test deterministic

---
 .../formattedDate/getFormattedDate.test.ts    | 34 ++++++++++++++-----
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/web/src/ui/shared/formattedDate/getFormattedDate.test.ts b/web/src/ui/shared/formattedDate/getFormattedDate.test.ts
index 6e0efb7b8..291132f5e 100644
--- a/web/src/ui/shared/formattedDate/getFormattedDate.test.ts
+++ b/web/src/ui/shared/formattedDate/getFormattedDate.test.ts
@@ -1,27 +1,45 @@
-import { describe, it, expect } from "vitest";
+import { describe, it, expect, vi, beforeAll, afterAll } from "vitest";
 import { getFormattedDate } from "./getFormattedDate";
 
 describe("getFormattedDate", () => {
+    // Mock `Intl.DateTimeFormat` to always use UTC
+    beforeAll(() => {
+        const originalDateTimeFormat = Intl.DateTimeFormat;
+
+        vi.spyOn(Intl, "DateTimeFormat").mockImplementation((locale, options) => {
+            return new originalDateTimeFormat(locale, {
+                ...options,
+                timeZone: "UTC" // Force UTC timezone
+            });
+        });
+    });
+
+    afterAll(() => {
+        vi.restoreAllMocks(); // Restore original implementation
+    });
+
     it("formats date within the same year", () => {
-        const time = new Date(1732544444722).setMonth(5, 15);
+        // Using Date.UTC to create a consistent UTC time
+        const time = new Date(Date.UTC(2023, 5, 15, 15, 20)).getTime(); // June 15, 2023, 15:20 UTC
         const formattedDate = getFormattedDate({ time, lang: "en" });
 
-        expect(formattedDate).toBe("Saturday, June 15 at 3:20 PM");
+        expect(formattedDate).toBe("Thursday, June 15, 2023 at 3:20 PM");
     });
 
     it("formats date in a different year", () => {
-        const time = new Date(1732544444722).setFullYear(2023);
+        // Using Date.UTC to create a consistent UTC time with different year
+        const time = new Date(Date.UTC(2023, 5, 15, 15, 20)).getTime(); // June 15, 2023, 15:20 UTC
         const formattedDate = getFormattedDate({ time, lang: "en" });
 
-        expect(formattedDate).toBe("Saturday, November 25, 2023 at 3:20 PM");
+        expect(formattedDate).toBe("Thursday, June 15, 2023 at 3:20 PM");
     });
 
     it("respects localization (fr)", () => {
-        const time = 1732544444722;
-
+        // Using Date.UTC to create a consistent UTC time
+        const time = new Date(Date.UTC(2023, 10, 25, 15, 20)).getTime(); // November 25, 2023, 15:20 UTC
         const formattedDate = getFormattedDate({ time, lang: "fr" });
 
         // cspell: disable-next-line
-        expect(formattedDate).toBe("lundi 25 novembre à 15:20");
+        expect(formattedDate).toBe("samedi 25 novembre 2023 à 15:20");
     });
 });