Replaced respond_with_content_type with assert.
Replaced respond_with_content_type with assert.

ari/jobsworth,webstream-io/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,webstream-io/jobsworth,ari/jobsworth,webstream-io/jobsworth,ari/jobsworth,webstream-io/jobsworth,ari/jobsworth