code: func New() (*Execution, error) {
  	env, err := environment.New()
  	if err != nil {
  		return nil, err
  	}
  
  	dockerBinary, err := exec.LookPath(DefaultClientBinary)
  	if err != nil {
  		return nil, err
  	}
  
  	return &Execution{
  		Execution:    *env,
  		dockerBinary: dockerBinary,
  	}, nil
  }
docs: // New returns details about the testing environment