old_contents: from django.test import TestCase
  from django.core.files.base import ContentFile
  from django.conf import settings
  from django.core.files.storage import FileSystemStorage
  from uuid import uuid4
  import os
  from storages.backends.s3boto import S3BotoStorage
  
  class S3BotoStorageTests(TestCase):
      def setUp(self):
          self.storage = S3BotoStorage()
          
          # use a unique folder namespace for tests
          path_prefix = "test-subfolder/"
          dirs, files = self.storage.listdir(path_prefix)
          while dirs or files:
              path_prefix = "test-subfolder-%s/" % uuid4()
              dirs, files = self.storage.listdir(path_prefix)
          self.path_prefix = path_prefix
      
      def tearDown(self):
          # delete all files created during each test
          name = self.storage._normalize_name(self.storage._clean_name(self.path_prefix))
          dirlist = self.storage.bucket.list(self.storage._encode_name(name))
          names = [x.name for x in dirlist]
          for name in names:
              self.storage.delete(name)
          
      def prefix_path(self, path):
          return "%s%s" % (self.path_prefix, path)
      
      def test_storage_save(self):
          name = self.prefix_path('test_storage_save.txt')
          content = 'new content'
          self.storage.save(name, ContentFile(content))
          self.assertEqual(self.storage.open(name).read(), content)
      
      def test_storage_open_for_writing(self):
          name = self.prefix_path('test_open_for_writing.txt')
          content = 'new content'
          file = self.storage.open(name, 'w')
          file.write(content)
          file.close()
          self.assertEqual(self.storage.open(name).read(), content)
          
new_contents: from django.test import TestCase
  from django.core.files.base import ContentFile
  from django.conf import settings
  from django.core.files.storage import FileSystemStorage
  from uuid import uuid4
  import os
  from storages.backends.s3boto import S3BotoStorage
  
  class S3BotoStorageTests(TestCase):
      def setUp(self):
          self.storage = S3BotoStorage()
          
          # use a unique folder namespace for tests
          path_prefix = "test-subfolder/"
          dirs, files = self.storage.listdir(path_prefix)
          while dirs or files:
              path_prefix = "test-subfolder-%s/" % uuid4()
              dirs, files = self.storage.listdir(path_prefix)
          self.path_prefix = path_prefix
      
      def tearDown(self):
          # delete all files created during each test
          name = self.storage._normalize_name(self.storage._clean_name(self.path_prefix))
          dirlist = self.storage.bucket.list(self.storage._encode_name(name))
          names = [x.name for x in dirlist]
          for name in names:
              self.storage.delete(name)
          
      def prefix_path(self, path):
          return "%s%s" % (self.path_prefix, path)
      
      def test_storage_save(self):
          name = self.prefix_path('test_storage_save.txt')
          content = 'new content'
          self.storage.save(name, ContentFile(content))
          self.assertEqual(self.storage.open(name).read(), content)
      
      def test_storage_open(self):
          name = self.prefix_path('test_open_for_writing.txt')
          content = 'new content'
          file = self.storage.open(name, 'w')
          file.write(content)
          file.close()
          self.assertEqual(self.storage.open(name, 'r').read(), content)
          
subject: rename test_storage_open_for_writing to test_storage_open and explicitly assign open modes