[MERGE] Convert non-ascii blackbox tests to use internals where appropriate

[Alexander Belchenko]

Alexander Belchenko has voted approve.
Status is now: Semi-approved
Comment:
this patch was approved before. and now it merges with bzr.dev cleanly.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20071106094534.491f7911%40lapbert%3E