Files are not always available from storage despite DEBUG=False

For example, in tests. So instead of switching on DEBUG, we first try to
find a file from the finders, and then fall back to storage if that
doesn't work.

django_pyscss/utils.py

@@ -1,7 +1,6 @@
 import fnmatch
 import os
 
-from django.conf import settings
 from django.contrib.staticfiles import finders
 from django.contrib.staticfiles.storage import staticfiles_storage
 
@@ -40,8 +39,10 @@ def get_file_from_finders(filename):
 
 
 def get_file_and_storage(filename):
-    # TODO: the switch probably shouldn't be on DEBUG
-    if settings.DEBUG:
-        return get_file_from_finders(filename)
-    else:
-        return get_file_from_storage(filename)
+    name, storage = get_file_from_finders(filename)
+    # get_file_from_finders could fail in production if code is a deployed as a
+    # package without it's package_data. In that case, we'd assume that
+    # collectstatic had been run and we can get the file from storage.
+    if storage is None:
+        name, storage = get_file_from_storage(filename)
+    return name, storage

setup.py

@@ -23,6 +23,7 @@ tests_require = [
     'Pillow',
     'django-compressor>=1.3',
     'django-discover-runner',
+    'mock',
 ]
 
 

tests/test_scss.py

@@ -1,8 +1,8 @@
 import os
 import re
+import mock
 
 from django.test import TestCase
-from django.test.utils import override_settings
 from django.conf import settings
 
 from scss.errors import SassImportError
@@ -99,12 +99,14 @@ class ImportTestMixin(CompilerTestMixin):
         self.assertEqual(clean_css(actual), clean_css(PATH_CONFLICT_CONTENTS))
 
 
-@override_settings(DEBUG=True)
 class FindersImportTest(ImportTestMixin, NoCollectStaticTestCase):
     pass
 
 
-@override_settings(DEBUG=False)
+# Emulate the condition were collectstatic was run but the source files are no
+# longer available.
+@mock.patch('django_pyscss.utils.get_file_from_finders',
+            new=mock.MagicMock(return_value=(None, None)))
 class StorageImportTest(ImportTestMixin, CollectStaticTestCase):
     pass