Ugly, garbled output from autotest

I am getting this horribly ugly output from autotest when a test fails.

Normal output from 'rake test':

could those be ansi color codes?

try adding this to the config block in you environment.rb do |config|
  config.active_record.colorize_logging = false

That's unit_diff output. Sometimes it's great, sometimes it's ugly. If
you want to turn it off, try putting this in your .autotest file:

unit_diff = "cat"

~ j.