Django saying 'course' isn't a registered namespace upon running tests.

ERROR: test_course_list_view (courses.tests.CourseViewsTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/urls/base.py", line 77, in reverse
    extra, resolver = resolver.namespace_dict[ns]
KeyError: 'course'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/learning_site/courses/tests.py", line 57, in test_course_list_view
    resp = self.client.get(reverse('courses:list'))
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/client.py", line 536, in get
    **extra)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/client.py", line 340, in get
    return self.generic('GET', path, secure=secure, **r)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/client.py", line 416, in generic
    return self.request(**r)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/client.py", line 501, in request
    six.reraise(*exc_info)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/utils/six.py", line 686, in reraise
    raise value
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/learning_site/courses/views.py", line 6, in course_list
    return render(request, 'courses/course_list.html', {'courses': courses})
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/shortcuts.py", line 30, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/loader.py", line 68, in render_to_string
    return template.render(context, request)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/backends/django.py", line 66, in render
    return self.template.render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/base.py", line 207, in render
    return self._render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/utils.py", line 107, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/base.py", line 990, in render
    bit = node.render_annotated(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/loader_tags.py", line 177, in render
    return compiled_parent._render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/test/utils.py", line 107, in instrumented_test_render
    return self.nodelist.render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/base.py", line 990, in render
    bit = node.render_annotated(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/base.py", line 957, in render_annotated
    return self.render(context)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/template/defaulttags.py", line 458, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
  File "/Users/Adam/Desktop/Treehouse/DjangoBasics/djangobasics/lib/python3.5/site-packages/django/urls/base.py", line 87, in reverse
    raise NoReverseMatch("%s is not a registered namespace" % key)
django.urls.exceptions.NoReverseMatch: 'course' is not a registered namespace

from django.conf.urls import url
from django.contrib import admin
from . import views
from django.conf.urls import include
from django.contrib.staticfiles.urls import staticfiles_urlpatterns

urlpatterns = [
    url(r'^courses/', include('courses.urls', namespace='courses')),
    url(r'^admin/', admin.site.urls),
    url(r'^$', views.home, name="home"),
]

urlpatterns += staticfiles_urlpatterns()

urlpatterns = [
    url(r'^$', views.course_list, name='list'),
    url(r'(?P<course_pk>\d+)/(?P<step_pk>\d+)/$', views.step_detail, name="step"),
    url(r'(?P<pk>\d+)/$', views.course_detail, name="detail"),
]

class CourseViewsTests(TestCase):
    def setUp(self):
        self.course = Course.objects.create(
            title="Python Testing",
            description="Sample description"
        )
        self.course2 = Course.objects.create(
            title="New Course",
            description="New course description"
        )
        self.step = Step.objects.create(
            title="Intro to Doctests",
            description="Learn to write tests in your docstrings",
            course=self.course
        )

    def test_course_list_view(self):
        resp = self.client.get(reverse('courses:list'))
        self.assertEqual(resp.status_code, 200)
        self.assertIn(self.course, resp.context['courses'])
        self.assertIn(self.course2, resp.context['courses'])