Remove django cas server in CI dependencies

corres2math/settings.py

@@ -51,7 +51,6 @@ INSTALLED_APPS = [
     'django.forms',
 
     'bootstrap_datepicker_plus',
-    'cas_server',
     'crispy_forms',
     'django_tables2',
     'haystack',
@@ -68,6 +67,7 @@ INSTALLED_APPS = [
 
 if "test" not in sys.argv:  # pragma: no cover
     INSTALLED_APPS += [
+        'cas_server',
         'django_extensions',
         'mailer',
     ]

corres2math/urls.py

@@ -13,6 +13,7 @@ Including another URLconf
     1. Import the include() function: from django.urls import include, path
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
+from django.conf import settings
 from django.contrib import admin
 from django.urls import include, path
 from django.views.defaults import bad_request, page_not_found, permission_denied, server_error
@@ -35,11 +36,14 @@ urlpatterns = [
 
     path('media/authorization/photo/<str:filename>/', PhotoAuthorizationView.as_view(), name='photo_authorization'),
 
-    path('cas/', include('cas_server.urls', namespace="cas_server")),
-
     path('', include('eastereggs.urls')),
 ]
 
+if 'cas_server' in settings.INSTALLED_APPS:  # pragma: no cover
+    urlpatterns += [
+        path('cas/', include('cas_server.urls', namespace="cas_server")),
+    ]
+
 handler400 = bad_request
 handler403 = permission_denied
 handler404 = page_not_found