Add i18n roundtrip regression tests for language pref and dark lang

Tests would have caught issues raised in LOC-87

lms/djangoapps/courseware/tests/test_i18n.py

@@ -4,10 +4,16 @@ Tests i18n in courseware
 import re
 from nose.plugins.attrib import attr
 
+from django.conf import settings
 from django.contrib.auth.models import User
+from django.core.urlresolvers import reverse, NoReverseMatch
 from django.test import TestCase
+from django.test.client import Client
 
 from dark_lang.models import DarkLangConfig
+from lang_pref import LANGUAGE_KEY
+from openedx.core.djangoapps.user_api.preferences.api import set_user_preference
+from student.tests.factories import UserFactory, RegistrationFactory, UserProfileFactory
 
 
 class BaseI18nTestCase(TestCase):
@@ -91,3 +97,96 @@ class I18nRegressionTests(BaseI18nTestCase):
         # receive files for 'fa'
         response = self.client.get('/', HTTP_ACCEPT_LANGUAGE='fa-ir')
         self.assert_tag_has_attr(response.content, "html", "lang", "fa")
+
+        # Now try to access with dark lang
+        response = self.client.get('/?preview-lang=fa-ir')
+        self.assert_tag_has_attr(response.content, "html", "lang", "fa-ir")
+
+    def test_preview_lang(self):
+        # Regression test; LOC-87
+        self.release_languages('es-419')
+        site_lang = settings.LANGUAGE_CODE
+        # Visit the front page; verify we see site default lang
+        response = self.client.get('/')
+        self.assert_tag_has_attr(response.content, "html", "lang", site_lang)
+
+        # Verify we can switch language using the preview-lang query param
+        response = self.client.get('/?preview-lang=eo')
+        self.assert_tag_has_attr(response.content, "html", "lang", "eo")
+        # We should be able to see released languages using preview-lang, too
+        response = self.client.get('/?preview-lang=es-419')
+        self.assert_tag_has_attr(response.content, "html", "lang", "es-419")
+
+        # Clearing the language should go back to site default
+        response = self.client.get('/?clear-lang')
+        self.assert_tag_has_attr(response.content, "html", "lang", site_lang)
+
+
+@attr('shard_1')
+class I18nLangPrefTests(BaseI18nTestCase):
+    """
+    Regression tests of language presented to the user, when they
+    choose a language preference, and when they have a preference
+    and use the dark lang preview functionality.
+    """
+    def setUp(self):
+        super(I18nLangPrefTests, self).setUp()
+        # Create one user and save it to the database
+        email = 'test@edx.org'
+        pwd = 'test_password'
+        self.user = UserFactory.build(username='test', email=email)
+        self.user.set_password(pwd)
+        self.user.save()
+
+        # Create a registration for the user
+        RegistrationFactory(user=self.user)
+
+        # Create a profile for the user
+        UserProfileFactory(user=self.user)
+
+        # Create the test client
+        self.client = Client()
+
+        # Get the login url & log in our user
+        try:
+            login_url = reverse('login_post')
+        except NoReverseMatch:
+            login_url = reverse('login')
+        self.client.post(login_url, {'email': email, 'password': pwd})
+
+        # Url and site lang vars for tests to use
+        self.url = reverse('dashboard')
+        self.site_lang = settings.LANGUAGE_CODE
+
+    def test_lang_preference(self):
+        # Regression test; LOC-87
+        self.release_languages('ar, es-419')
+
+        # Visit the front page; verify we see site default lang
+        response = self.client.get(self.url)
+        self.assert_tag_has_attr(response.content, "html", "lang", self.site_lang)
+
+        # Set user language preference
+        set_user_preference(self.user, LANGUAGE_KEY, 'ar')
+        # and verify we now get an ar response
+        response = self.client.get(self.url)
+        self.assert_tag_has_attr(response.content, "html", "lang", 'ar')
+
+        # Verify that switching language preference gives the right language
+        set_user_preference(self.user, LANGUAGE_KEY, 'es-419')
+        response = self.client.get(self.url)
+        self.assert_tag_has_attr(response.content, "html", "lang", 'es-419')
+
+    def test_preview_precedence(self):
+        # Regression test; LOC-87
+        self.release_languages('ar, es-419')
+
+        # Set user language preference
+        set_user_preference(self.user, LANGUAGE_KEY, 'ar')
+        # Verify preview-lang takes precedence
+        response = self.client.get('{}?preview-lang=eo'.format(self.url))
+        self.assert_tag_has_attr(response.content, "html", "lang", 'eo')
+
+        # Clearing language must set language back to preference language
+        response = self.client.get('{}?clear-lang'.format(self.url))
+        self.assert_tag_has_attr(response.content, "html", "lang", 'ar')