NewExecutor returns an executor from the docker client.

NewStubAPIClient returns an initialized StubAPIClient.

ErrContainerDestroyed returned when a container is prematurely destroyed during a wait call.

ErrContainerUnhealthy returned if controller detects the health check failure.

ErrImageRequired returned if a task is missing the image definition.

StubAPIClient implements the client.APIClient interface, but allows you to specify the behavior of each of the methods.