i18n settings improvements (#2184)

* Handle language selector

* Improve type safety

* Add a little more safety

* Update comment

1 files changed, 12 insertions, 0 deletions

diff --git a/src/locale/__tests__/helpers.test.ts b/src/locale/__tests__/helpers.test.ts
new file mode 100644
index 000000000..d4bc6c338
--- /dev/null
+++ b/src/locale/__tests__/helpers.test.ts
@@ -0,0 +1,12 @@
+import {test, expect} from '@jest/globals'
+
+import {sanitizeAppLanguageSetting} from '#/locale/helpers'
+import {AppLanguage} from '#/locale/languages'
+
+test('sanitizeAppLanguageSetting', () => {
+  expect(sanitizeAppLanguageSetting('en')).toBe(AppLanguage.en)
+  expect(sanitizeAppLanguageSetting('hi')).toBe(AppLanguage.hi)
+  expect(sanitizeAppLanguageSetting('foo')).toBe(AppLanguage.en)
+  expect(sanitizeAppLanguageSetting('en,fr')).toBe(AppLanguage.en)
+  expect(sanitizeAppLanguageSetting('fr,en')).toBe(AppLanguage.en)
+})