PipelineCachedStorage breaks app tests

I made a test app to highlight this bug: https://github.com/amarandon/trypipeline/tree/with-pipeline

I have a trivial test:

from django.test import TestCase

class TestHome(TestCase):

    def test_home(self):
        response = self.client.get('/')
        self.assertContains(response, 'css')

As soon as I add this to my settings:

STATICFILES_STORAGE = 'pipeline.storage.PipelineCachedStorage'

The test breaks with this error:

Traceback (most recent call last):
  File "/home/al/projects/trypipeline/main/tests.py", line 7, in test_home
    response = self.client.get('/')
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/test/client.py", line 473, in get
    response = super(Client, self).get(path, data=data, **extra)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/test/client.py", line 280, in get
    return self.request(**r)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/test/client.py", line 444, in request
    six.reraise(*exc_info)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/utils/six.py", line 491, in reraise
    raise value
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/core/handlers/base.py", line 114, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/al/projects/trypipeline/main/views.py", line 5, in home
    return render(request, 'main/home.html')
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/shortcuts/__init__.py", line 53, in render
    return HttpResponse(loader.render_to_string(*args, **kwargs),
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/template/loader.py", line 169, in render_to_string
    return t.render(context_instance)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/template/base.py", line 140, in render
    return self._render(context)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/test/utils.py", line 85, in instrumented_test_render
    return self.nodelist.render(context)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/template/base.py", line 840, in render
    bit = self.render_node(node, context)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/template/debug.py", line 78, in render_node
    return node.render(context)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/templatetags/static.py", line 106, in render
    url = self.url(context)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/contrib/staticfiles/templatetags/staticfiles.py", line 12, in url
    return staticfiles_storage.url(path)
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/contrib/staticfiles/storage.py", line 134, in url
    hashed_name = self.hashed_name(clean_name).replace('\\', '/')
  File "/home/al/projects/env/dummy/lib/python3.3/site-packages/django/contrib/staticfiles/storage.py", line 91, in hashed_name
    (clean_name, self))
ValueError: The file 'main/css/style.css' could not be found with <pipeline.storage.PipelineCachedStorage object at 0x7f853a37b850>.

Executing collectstatic solves this error. This is confusing because tests usually don’t require to run collectstatic. If this hard to fix in the code, we should probably mention this issue in the documentation with possible workarounds such as executing collectstatic before running tests or running test with settings that don’t enable PipelineCachedStorage. If this is the way to go then I’ll be happy to do a doc PR.

Tried against the master branch, commit 68646764b68a43e6136254c3aa5c27e2ad50f008 Django 1.6, Python 3.3.1

[jdufresne]

I too am running into this issue. I’ve added the following to my settings.py to workaround this issue.

if DEBUG:
    STATICFILES_STORAGE = 'pipeline.storage.PipelineStorage'
else:
    STATICFILES_STORAGE = 'pipeline.storage.PipelineCachedStorage'

[rightx2]

Perfect! @jdufresne