Add unit tests for the `i18n.py` module

Signed-off-by: Mihaela Balutoiu <mbalutoiu@cloudbasesolutions.com>

coriolis/tests/test_i18n.py

@@ -0,0 +1,32 @@
+# Copyright 2023 Cloudbase Solutions Srl
+# All Rights Reserved.
+
+from unittest import mock
+
+from coriolis import i18n
+from coriolis.tests import test_base
+
+
+class I18nTestCase(test_base.CoriolisBaseTestCase):
+    """Test suite for the Coriolis i18n module."""
+
+    @mock.patch('oslo_i18n.enable_lazy')
+    def test_enable_lazy(self, mock_enable_lazy):
+        result = i18n.enable_lazy(True)
+
+        mock_enable_lazy.assert_called_once_with(True)
+        self.assertEqual(result, mock_enable_lazy.return_value)
+
+    @mock.patch('oslo_i18n.translate')
+    def test_translate(self, mock_translate):
+        result = i18n.translate('test_value')
+
+        mock_translate.assert_called_once_with('test_value', None)
+        self.assertEqual(result, mock_translate.return_value)
+
+    @mock.patch('oslo_i18n.get_available_languages')
+    def test_get_available_languages(self, mock_get_available_languages):
+        result = i18n.get_available_languages()
+
+        mock_get_available_languages.assert_called_once_with(i18n.DOMAIN)
+        self.assertEqual(result, mock_get_available_languages.return_value)