anchor.diff:  %%
   
   docker_linux(_) ->
  -    error("not implemented yet").
  +    Name = container_name("docker-linux-"),
  +    Fdlink = erlsh:fdlink_executable(),
  +    Args = [which("docker"), "run", "-t", "--rm", "--name", Name, "erlang:19-slim", "bash"],
  +    ContainerPort = erlang:open_port({spawn_executable, Fdlink}, [stream, exit_status, {args, Args}]),
  +    try
  +        ct:fail("not implemented yet")
  +    after
  +        sh("docker stop " ++ Name)
  +    end.
   
   %%
   %% Helpers
  
positive.code: -include_lib("eunit/include/eunit.hrl").
  
  -define(eq(Expected, Actual), ?assertEqual(Expected, Actual)).
  
  all() ->
      [docker_linux].
  
negative.code:     Config.
  
  prerequisites() ->
      [
       { "docker in $PATH?",
         fun (_Config) ->
                 {done, 0, <<"Docker", _/bytes>>} = erlsh:oneliner("docker -v")
  