Mock() function gives TypeError in django2

I'm following this tutorial.

When I run test_views.py I have an error that shouldn't be there according the author: TypeError: quote_from_bytes() expected bytes.

My views and my test_views are the same like the book, but I'm using django 2.0.6 instead django 1.11 so my url.py change, so maybe here's the problem.

Edit:

at a second look the problem appears to be in the mock() function.

When I use patch('lists.views.List') the Print(list_) in my view gives <MagicMock name='List()' id='79765800'> instead of List object (1)

/edit

My lists/urls.py:

urlpatterns = [
    path('new', views.new_list, name='new_list'),
    path('<slug:list_id>/',
        views.view_list, name='view_list'),
    path('users/<email>/',         # I'm not sure about this one but it works in other tests
        views.my_lists, name='my_lists'),
]
#instead of:
#urlpatterns = [
#    url(r'^new$', views.new_list, name='new_list'),
#    url(r'^(\d+)/$', views.view_list, name='view_list'),
#    url(r'^users/(.+)/$', views.my_lists, name='my_lists'),
#]

My lists/views.py:

[...]
def new_list(request):
    form = ItemForm(data=request.POST)
    if form.is_valid():
        list_ = List()
        list_.owner = request.user
        list_.save()
        form.save(for_list=list_)
        Print(list_)
        return redirect(list_)
    else:
        return render(request, 'home.html', {"form": form})

My lists/tests/test_views.py:

@patch('lists.views.List')
@patch('lists.views.ItemForm')
def test_list_owner_is_saved_if_user_is_authenticated(self, 
    mockItemFormClass, mockListClass
):
    user = User.objects.create(email='a@b.com')
    self.client.force_login(user)
    self.client.post('/lists/new', data={'text': 'new item'})
    mock_list = mockListClass.return_value
    self.assertEqual(mock_list.owner, user)

My full traceback:

What can be?

thank you

At last I found the solution on-line.

Django 2 doesn't support anymore bytestrings in some places so when the views redirect the mock Class List it does as a mock object and the iri_to_uri django function throws an error. In django 1.11 iri_to_uri forced the iri to a bytes return quote(force_bytes(iri), safe="/#%[]=:;$&()+,!?*@'~") instead now is return quote(iri, safe="/#%[]=:;$&()+,!?*@'~"). So the solution is to return redirect(str(list_.get_absolute_url())) instead of return redirect(list_) in the lists.views.py

def new_list(request):
    form = ItemForm(data=request.POST)
    if form.is_valid():
        list_ = List()
        list_.owner = request.user
        list_.save()
        form.save(for_list=list_)
        #return redirect(list_)
        return redirect(str(list_.get_absolute_url()))
    else:
        return render(request, 'home.html', {"form": form})

I hope this helps someone else