code: func (d *DockerHelper) CreateContainers(num int) []string {
  	ids := []string{}
  	for i := 0; i < num; i++ {
  		name := newContainerName()
  		cfg := &container.Config{
  			AttachStderr: false,
  			AttachStdin:  false,
  			AttachStdout: false,
  			Tty:          true,
  			Cmd:          strslice.StrSlice([]string{TestCommand}),
  			Image:        TestImage,
  		}
  		container, err := d.client.ContainerCreate(getContext(), cfg, &container.HostConfig{}, &network.NetworkingConfig{}, name)
  		ids = append(ids, container.ID)
  		d.errStats.add("create containers", err)
  	}
  	return ids
  }
docs: // CreateContainers creates num of containers, returns a slice of container ids