GREG-60: Adding a test for phone numbers

frontend/src/utils/index.test.ts

+import { isValidMobilePhoneNumber } from './index'
+
+// Mock i18next module to return a translation that just returns the key
+jest.mock('i18next', () => ({
+  t: (value: string) => value,
+}))
+
+test('Invalid phone number', async () => {
+  expect(isValidMobilePhoneNumber('dafasfdsfasdf')).not.toEqual(true)
+})
+
+test('Valid phone number', async () => {
+  expect(isValidMobilePhoneNumber('+47 97510000')).toEqual(true)
+})

frontend/src/utils/index.ts

@@ -52,7 +52,10 @@ export function isValidFnr(data: string | undefined): boolean | string {
   return i18n.t('common:validation.invalidIdNumber').toString()
 }
 
-export function isValidMobilePhoneNumber(data: string): boolean | string {
+export function isValidMobilePhoneNumber(data: string | undefined): boolean | string {
+  if (!data) {
+    return i18n.t('common:validation.invalidMobilePhoneNumber').toString()
+  }
   const valid = isValidPhoneNumber(data)
   if (valid) {
     return true