This is a bundle of snippets for TextMate.
The MiniTest bundle is currently focusing on the spec snippets, since the assert snippets are already included in the default Ruby bundle.
You can install this bundle locally by cloning it into the Application Support/Avian directory:
mkdir -p ~/Library/Application\ Support/Avian/Pristine\ Copy/Bundles
cd ~/Library/Application\ Support/Avian/Pristine\ Copy/Bundles
git clone https://github.com/jish/MiniTest.tmbundle.git
Reloading bundles is not necessary with TextMate 2