Checks locales are real in resolveCanonicalLocales

ts/test-node/util/resolveCanonicalLocales_test.ts

@@ -0,0 +1,22 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import assert from 'node:assert/strict';
+import { resolveCanonicalLocales } from '../../util/resolveCanonicalLocales';
+
+describe('resolveCanonicalLocales', () => {
+  it('returns an array of canonical locales', () => {
+    assert.deepEqual(
+      resolveCanonicalLocales(['EN', 'EN-US', 'EN-GB', 'FR', 'FR-FR']),
+      ['en', 'en-US', 'en-GB', 'fr', 'fr-FR']
+    );
+  });
+
+  it('removes invalid locales', () => {
+    assert.deepEqual(resolveCanonicalLocales(['!@#$', 'POSIX', 'en']), ['en']);
+  });
+
+  it('defaults to en if no valid locales are provided', () => {
+    assert.deepEqual(resolveCanonicalLocales(['!@#$']), ['en']);
+  });
+});