1 files changed, 54 insertions, 0 deletions
diff --git a/tests/urlpatterns_reverse/test_localeregexdescriptor.py b/tests/urlpatterns_reverse/test_localeregexdescriptor.py
new file mode 100644
index 0000000000..25e6cd962a
--- /dev/null
+++ b/tests/urlpatterns_reverse/test_localeregexdescriptor.py
@@ -0,0 +1,54 @@
+import os
+from unittest import mock
+
+from django.core.exceptions import ImproperlyConfigured
+from django.test import SimpleTestCase, override_settings
+from django.urls.resolvers import LocaleRegexDescriptor, RegexPattern
+from django.utils import translation
+
+here = os.path.dirname(os.path.abspath(__file__))
+
+
+@override_settings(LOCALE_PATHS=[os.path.join(here, 'translations', 'locale')])
+class LocaleRegexDescriptorTests(SimpleTestCase):
+    def setUp(self):
+        translation.trans_real._translations = {}
+
+    def tearDown(self):
+        translation.trans_real._translations = {}
+
+    def test_translated_regex_compiled_per_language(self):
+        provider = RegexPattern(translation.gettext_lazy('^foo/$'))
+        with translation.override('de'):
+            de_compiled = provider.regex
+            # compiled only once per language
+            error = AssertionError('tried to compile url regex twice for the same language')
+            with mock.patch('django.urls.resolvers.re.compile', side_effect=error):
+                de_compiled_2 = provider.regex
+        with translation.override('fr'):
+            fr_compiled = provider.regex
+        self.assertEqual(fr_compiled.pattern, '^foo-fr/$')
+        self.assertEqual(de_compiled.pattern, '^foo-de/$')
+        self.assertEqual(de_compiled, de_compiled_2)
+
+    def test_nontranslated_regex_compiled_once(self):
+        provider = RegexPattern('^foo/$')
+        with translation.override('de'):
+            de_compiled = provider.regex
+        with translation.override('fr'):
+            # compiled only once, regardless of language
+            error = AssertionError('tried to compile non-translated url regex twice')
+            with mock.patch('django.urls.resolvers.re.compile', side_effect=error):
+                fr_compiled = provider.regex
+        self.assertEqual(de_compiled.pattern, '^foo/$')
+        self.assertEqual(fr_compiled.pattern, '^foo/$')
+
+    def test_regex_compile_error(self):
+        """Regex errors are re-raised as ImproperlyConfigured."""
+        provider = RegexPattern('*')
+        msg = '"*" is not a valid regular expression: nothing to repeat'
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            provider.regex
+
+    def test_access_locale_regex_descriptor(self):
+        self.assertIsInstance(RegexPattern.regex, LocaleRegexDescriptor)