code: func (b *binary) Cmd(args ...string) *exec.Cmd {
  	cmd := exec.Command(b.binPath, args...)
  	cmd.Dir = b.workDir
  	cmd.Env = os.Environ()
  
  	// Disable checkpoint since we don't want to harass that service when
  	// our tests run. (This does, of course, mean we can't actually do
  	// end-to-end testing of our Checkpoint interactions.)
  	cmd.Env = append(cmd.Env, "CHECKPOINT_DISABLE=1")
  
  	cmd.Env = append(cmd.Env, b.env...)
  
  	return cmd
  }
docs: // Cmd returns an exec.Cmd pre-configured to run the generated Terraform
  // binary with the given arguments in the temporary working directory.
  //
  // The returned object can be mutated by the caller to customize how the
  // process will be run, before calling Run.