How can I wait for a docker container to be up and running?

When running a service inside a container, let's say mongodb, the command docker run -d myimage will exit instantly, and return the container id. In my CI script, I run a client to test mongodb connection, right after running the mongo container. The problem is: the client can't connect because the service is not up yet. Apart from adding a big sleep 10in my script, I don't see any option to wait