update urls.pyes to use path() and add some tests

facts/urls.py

@@ -1,5 +1,4 @@
 """URL patterns for the facts web views."""
-from django.conf.urls import url
 from django.urls import path
 
 from facts.views import factcategory_detail, index, rpc_get_facts, rpc_get_random_fact
@@ -8,6 +7,6 @@ urlpatterns = [
     path('rpc/<category>/', rpc_get_facts, name='weather_rpc_get_facts'),
     path('rpc/<category>/random/', rpc_get_random_fact, name='weather_rpc_get_random_fact'),
 
-    url(r'^$', index, name='facts_index'),
-    url(r'^(?P<factcategory_name>.+)/$', factcategory_detail, name='facts_factcategory_detail'),
+    path('', index, name='facts_index'),
+    path('<factcategory_name>/', factcategory_detail, name='facts_factcategory_detail'),
 ]