Since busted seems to spawn isolated child processes for every test
suite, the temporary PATH directories have to be created at the
beginning and destroyed at the end of a test suite.
We cannot possibly know what is in the PATH of a user. The completion
test cases however assume that there is nothing else in the PATH that
starts with `true` other than `true` itself.
These two methods create or respectively destroy a temporary PATH
directory especially for testing. We can put commands in there via
symlinks and verify the correct functionality of the complete commands.
The PATH environment variable is set and reset via GLib.
Florian Gamböck
Daniel Hahler
Daniel Hahler