Add unit tests
Add unit tests

Signed-off-by: Keerthan Reddy Mala <e58d3803171fbf29beb7c25372c66d87dacc0eeb@deis.com>

auready/docker-py,vpetersson/docker-py,docker/docker-py,kaiyou/docker-py,youhong316/docker-py,youhong316/docker-py,funkyfuture/docker-py,minzhang28/docker-py,docker/docker-py,vdemeester/docker-py,vpetersson/docker-py,minzhang28/docker-py,dimaspivak/docker-py,bfirsh/docker-py,bfirsh/docker-py,dimaspivak/docker-py,kaiyou/docker-py,funkyfuture/docker-py,auready/docker-py,vdemeester/docker-py