remove in-memory files

no need to create zero by in memory images

added contents to test upload files

cms/djangoapps/contentstore/views/tests/test_assets.py

@@ -8,7 +8,6 @@ from PIL import Image
 import json
 
 from django.conf import settings
-from django.test.utils import override_settings
 
 from contentstore.tests.utils import CourseTestCase
 from contentstore.views import assets
@@ -56,18 +55,19 @@ class AssetsTestCase(CourseTestCase):
         """
         Returns an in-memory file of the specified type with the given name for testing
         """
+        sample_asset = BytesIO()
+        sample_file_contents = "This file is generated by python unit test"
         if asset_type == 'text':
-            sample_asset = BytesIO(name)
             sample_asset.name = '{name}.txt'.format(name=name)
+            sample_asset.write(sample_file_contents)
         elif asset_type == 'image':
             image = Image.new("RGB", size=(50, 50), color=(256, 0, 0))
-            sample_asset = BytesIO()
-            image.save(unicode(sample_asset), 'jpeg')
+            image.save(sample_asset, 'jpeg')
             sample_asset.name = '{name}.jpg'.format(name=name)
-            sample_asset.seek(0)
         elif asset_type == 'opendoc':
-            sample_asset = BytesIO(name)
             sample_asset.name = '{name}.odt'.format(name=name)
+            sample_asset.write(sample_file_contents)
+        sample_asset.seek(0)
         return sample_asset
 
 
@@ -324,7 +324,7 @@ class DownloadTestCase(AssetsTestCase):
         # Now, download it.
         resp = self.client.get(self.uploaded_url, HTTP_ACCEPT='text/html')
         self.assertEquals(resp.status_code, 200)
-        self.assertEquals(resp.content, self.asset_name)
+        self.assertContains(resp, 'This file is generated by python unit test')
 
     def test_download_not_found_throw(self):
         url = self.uploaded_url.replace(self.asset_name, 'not_the_asset_name')