1 files changed, 41 insertions, 0 deletions
diff --git a/tests/urlpatterns_reverse/test_localeregexprovider.py b/tests/urlpatterns_reverse/test_localeregexprovider.py
new file mode 100644
index 0000000000..9da8df656c
--- /dev/null
+++ b/tests/urlpatterns_reverse/test_localeregexprovider.py
@@ -0,0 +1,41 @@
+from __future__ import unicode_literals
+
+import os
+
+from django.core.exceptions import ImproperlyConfigured
+from django.test import SimpleTestCase, mock, override_settings
+from django.urls import LocaleRegexProvider
+from django.utils import translation
+from django.utils._os import upath
+
+here = os.path.dirname(upath(os.path.abspath(__file__)))
+
+
+@override_settings(LOCALE_PATHS=[os.path.join(here, 'translations', 'locale')])
+class LocaleRegexProviderTests(SimpleTestCase):
+    def setUp(self):
+        translation.trans_real._translations = {}
+
+    def tearDown(self):
+        translation.trans_real._translations = {}
+
+    def test_translated_regex_compiled_per_language(self):
+        provider = LocaleRegexProvider(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_regex_compile_error(self):
+        """Regex errors are re-raised as ImproperlyConfigured."""
+        provider = LocaleRegexProvider('*')
+        msg = '"*" is not a valid regular expression: nothing to repeat'
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            provider.regex