anchor.diff:      start_container(Name, Args),
       try
           sh(["docker exec ", Name, " echo a"]),
  +        ct:pal("git commit: ~p", [current_git_commit()]),
           ct:fail("not implemented yet")
       after
           sh("docker stop " ++ Name)
  
positive.code:         sh(["docker ps | grep ", Name, " | grep Up"]),
          true
      catch _:_ -> false end.
  
negative.code: 
  prerequisites() ->
      [
       { "docker in $PATH", fun (_Config) -> {_, _, <<"Docker", _/bytes>>} = sh("docker -v") end },
       { "git in $PATH", fun (_) -> {_, _, <<"usage: git", _/bytes>>} = sh("git --help") end }
      ].
  
  end_per_suite(_Config) ->
  