> run "fork"
$ exists flag
$ delete flag

$ mkdir "forked"
> set fork := true
> 'set baseDirectory in run <<= baseDirectory(_ / "forked")'

> run "forked"
$ exists forked/flag
$ absent flag
$ delete forked/flag

> 'set envVars += ("flag.name" -> "env.flag")'
> run "forked"
$ exists forked/env.flag
$ absent flag
$ absent forked/flag
