When I run Kicker 3.0.0pre1 (on Mountain Lion, zsh) and I get a syntax error from either the test or an implementation file, something weird happens.
The output of the command is send to the terminal-notifier. Because it contains quotes the shell doesn't understand the command and prints an exception.
A solution would be to write the message to terminal-notifier through stdin instead of through an argument.
For an example see:
For Kicker it would probably be easier to escape the message. (I.e. #inspect the value.)
pre2 is using notify gem which should cover that