minitest-autotest

https://github.com/seattlerb/minitest-autotest

autotest is a continous testing facility meant to be used during development. As soon as you save a file, autotest will run the corresponding dependent tests. minitest-autotest is the latest incarnation of the venerable and wise autotest. This time, it talks to minitest via minitest-server. As a result, there is no output parsing. There are no regexps to tweak. There's no cruft or overhead. == Features/Problems: * Continually and intelligently test only those files you change with autotest.