Fix date-time-format test

src/utils/date-time-format.js

@@ -1,13 +1,23 @@
-import localeMatch from './locale-match';
+import localeMatch from './locale-match.js';
-import mem from './mem';
+import mem from './mem.js';
 
-const locales = [...navigator.languages];
+function initLocales() {
+  const newLocales = [...navigator.languages];
   try {
     const dtfLocale = new Intl.DateTimeFormat().resolvedOptions().locale;
-  if (!locales.includes(dtfLocale)) {
+    if (!newLocales.includes(dtfLocale)) {
-    locales.push(dtfLocale);
+      newLocales.push(dtfLocale);
     }
   } catch {}
+  return newLocales;
+}
+
+let locales = initLocales();
+
+// For testing: refresh locales from current navigator state
+export function refreshLocales() {
+  locales = initLocales();
+}
 
 const createLocale = mem((language, options = {}) => {
   try {

tests/date-time-format.spec.js

@@ -1,6 +1,8 @@
 // @ts-check
 import { test, expect } from '@playwright/test';
-import DateTimeFormat from '../src/utils/date-time-format.js';
+import DateTimeFormat, {
+  refreshLocales,
+} from '../src/utils/date-time-format.js';
 
 // Store original navigator properties for cleanup
 let originalLanguage;
@@ -22,6 +24,9 @@ const mockNavigator = (language, languages) => {
     get: () => languages || [language],
     configurable: true,
   });
+
+  // Automatically refresh locales after mocking
+  refreshLocales();
 };
 
 // Reset navigator to original state