chore(account): write tests for CreateAccessToken [EE-2561] (#6578)

app/__mocks__/i18next.ts

@@ -0,0 +1,36 @@
+function replaceBetween(
+  startIndex: number,
+  endIndex: number,
+  original: string,
+  insertion: string
+) {
+  const result =
+    original.substring(0, startIndex) +
+    insertion +
+    original.substring(endIndex);
+  return result;
+}
+
+export function mockT(i18nKey: string, args?: Record<string, string>) {
+  let key = i18nKey;
+
+  while (key.includes('{{') && args) {
+    const startIndex = key.indexOf('{{');
+    const endIndex = key.indexOf('}}');
+
+    const currentArg = key.substring(startIndex + 2, endIndex);
+    const value = args[currentArg];
+
+    key = replaceBetween(startIndex, endIndex + 2, key, value);
+  }
+
+  return key;
+}
+
+const i18next: Record<string, unknown> = jest.createMockFromModule('i18next');
+i18next.t = mockT;
+i18next.language = 'en';
+i18next.changeLanguage = () => new Promise(() => {});
+i18next.use = () => i18next;
+
+export default i18next;