Fix pri lang for rename mode

tests/unit/test_iso_language.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+from pathlib import Path
+import sys
+import unittest
+
+
+SRC_ROOT = Path(__file__).resolve().parents[2] / "src"
+
+if str(SRC_ROOT) not in sys.path:
+    sys.path.insert(0, str(SRC_ROOT))
+
+
+from ffx.iso_language import IsoLanguage  # noqa: E402
+
+
+class IsoLanguageTests(unittest.TestCase):
+    def test_language_constant_set_covers_iso_639_1_plus_filipino_alias(self):
+        languages = [language for language in IsoLanguage if language is not IsoLanguage.UNDEFINED]
+
+        self.assertEqual(184, len(languages))
+        self.assertEqual(183, len({language.twoLetter() for language in languages}))
+
+    def test_primary_three_letter_code_is_returned_first(self):
+        self.assertEqual("sqi", IsoLanguage.ALBANIAN.threeLetter())
+        self.assertEqual("deu", IsoLanguage.GERMAN.threeLetter())
+        self.assertEqual("cym", IsoLanguage.WELSH.threeLetter())
+
+    def test_secondary_three_letter_codes_still_resolve_to_the_same_language(self):
+        self.assertIs(IsoLanguage.ALBANIAN, IsoLanguage.findThreeLetter("alb"))
+        self.assertIs(IsoLanguage.GERMAN, IsoLanguage.findThreeLetter("ger"))
+        self.assertIs(IsoLanguage.WELSH, IsoLanguage.findThreeLetter("wel"))
+
+    def test_newly_added_languages_and_media_aliases_resolve(self):
+        self.assertIs(IsoLanguage.ASSAMESE, IsoLanguage.find("Assamese"))
+        self.assertIs(IsoLanguage.YORUBA, IsoLanguage.findThreeLetter("yor"))
+        self.assertIs(IsoLanguage.FILIPINO, IsoLanguage.findThreeLetter("fil"))
+
+
+if __name__ == "__main__":
+    unittest.main()