Essentially, my understand of best practice is to write high level functional tests for the features that appear to work and then use them to ensure there are n

Essentially, my understand of best practice is to write high level functional tests for the features that appear to work and then use them to ensure there are no regressions as a result of your changes. Someone people even define legacy code as "code without tests". http://www.amazon.com/Working-Effectively-Legacy-Michael-Feathers/dp/0131177052 http://www.amazon.com/Working-Effectively-Legacy-Michael-Fea...