gh-130655: Add tests for gettext.find()

Lib/test/test_gettext.py

@@ -717,6 +717,84 @@ def test_expand_lang(self):
                                          return_value=locale):
                     self.assertEqual(gettext._expand_lang(locale), expanded)
 
+# helper for FindTestCase
+def _clearvars(env):
+    for key in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
+        env.unset(key)
+
+class FindTestCase(unittest.TestCase):
+    def test_find_with_env_vars(self):
+        # test that find correctly finds the environment variable LANGUAGE
+        # when languages are not supplied
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            env.set('LANGUAGE', 'ga_IE')
+
+            locale_dir = os.path.join(tempdir, "locale")
+            mofile_dir = os.path.join(locale_dir, "ga_IE", "LC_MESSAGES")
+            os.makedirs(mofile_dir)
+            mo_file = os.path.join(mofile_dir, "mofile.mo")
+            with open(mo_file, "wb") as f:
+                f.write(b"\xDE\x12\x04\x95")
+
+            result = gettext.find("mofile", localedir=locale_dir)
+            self.assertEqual(result, mo_file)
+
+    def test_find_with_lanuages(self):
+        # test that passed languages are used
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            env.set('LANGUAGE', 'pt_BR')
+
+            locale_dir = os.path.join(tempdir, "locale")
+            mofile_dir = os.path.join(locale_dir, "ga_IE", "LC_MESSAGES")
+            os.makedirs(mofile_dir)
+            mo_file = os.path.join(mofile_dir, "mofile.mo")
+            with open(mo_file, "wb") as f:
+                f.write(b"\xDE\x12\x04\x95")
+
+            result = gettext.find("mofile", localedir=locale_dir, languages=['ga_IE'])
+            self.assertEqual(result, mo_file)
+
+    def test_find_with_no_lang(self):
+        # no language can be found
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            _clearvars(env)
+            result = gettext.find('foo')
+            self.assertEqual(result, None)
+
+    def test_find_with_c(self):
+        # 'C' is already in languages
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            env.set('LANGUAGE', 'C')
+            result = gettext.find('foo')
+            self.assertEqual(result, None)
+
+    def test_find_all(self):
+        # test that all are returned when all is set
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            _clearvars(env)
+
+            locale_dir = os.path.join(tempdir, "locale")
+            paths = []
+            for lang in ["ga_IE", "es_ES"]:
+                mofile_dir = os.path.join(locale_dir, lang, "LC_MESSAGES")
+                os.makedirs(mofile_dir)
+                mo_file = os.path.join(mofile_dir, "mofile.mo")
+                with open(mo_file, "wb") as f:
+                    f.write(b"\xDE\x12\x04\x95")
+                paths.append(mo_file)
+
+            result = gettext.find('mofile', localedir=locale_dir,
+                                  languages=["ga_IE", "es_ES"], all=True)
+            self.assertEqual(sorted(result), sorted(paths))
+
+    def test_find_dedupelication(self):
+        # test that find removes duplicate languages
+        with os_helper.EnvironmentVarGuard() as env, os_helper.temp_cwd() as tempdir:
+            _clearvars(env)
+
+            result = gettext.find("foo", languages=['ga_IE', 'ga_IE'])
+            self.assertEqual(result, None)
+
 
 class MiscTestCase(unittest.TestCase):
     def test__all__(self):