Add and update tests for video renderer

Author: cslzchen

tests/extensions/video/test_renderer.py

@@ -1,13 +1,13 @@
 import pytest
 
 from mfr.core.provider import ProviderMetadata
-
 from mfr.extensions.video import VideoRenderer
 
 
 @pytest.fixture
 def metadata():
-    return ProviderMetadata('test', '.mp4', 'text/plain', '1234', 'http://wb.osf.io/file/test.mp4?token=1234')
+    return ProviderMetadata('test', '.mp4', 'text/plain', '1234',
+                            'http://wb.osf.io/file/test.mp4?token=1234')
 
 
 @pytest.fixture
@@ -41,6 +41,7 @@ def test_render_video(self, renderer, url):
         body = renderer.render()
         assert '<video controls' in body
         assert 'src="{}"'.format(metadata().download_url) in body
+        assert '<style>body{margin:0;padding:0;}</style>' in ''.join(body.split())
 
     def test_render_video_file_required(self, renderer):
         assert renderer.file_required is False