old_contents: from django.conf.urls import include, url
  from django.contrib.auth import urls as auth_urls
  
  from . import views
  
  
  urlpatterns = [
      # URLs/Views required for testing
      url(
          r'^accounts/',
          include(auth_urls)
      ),
      url(
          r'^',
          include('apps.core.urls', namespace='core')
      ),
      url(
          r'^submission/',
          include('apps.submission.urls', namespace='submission')
      ),
      # Test app views
      url(
          r'^foo$',
          views.FooView.as_view(),
          name='foo'
      ),
  ]
  
new_contents: from django.conf.urls import include, url
  from django.contrib.auth import urls as auth_urls
  
  from . import views
  
  
  urlpatterns = [
      # URLs/Views required for testing
      url(
          r'^accounts/',
          include(auth_urls)
      ),
      url(
          r'^',
          include('apps.core.urls', namespace='core')
      ),
      url(
          r'^submission/',
          include('apps.submission.urls', namespace='submission')
      ),
      url(
          r'^explorer/',
          include('apps.explorer.urls', namespace='explorer')
      ),
      # Test app views
      url(
          r'^foo$',
          views.FooView.as_view(),
          name='foo'
      ),
  ]
  
subject: Add explorer urls to test mixin