Now i've always been test infected, in fact I believe since working on my BBC micro I've been eager to prove code works during every stage of the development. However it was thrust home to me today how important regression testing actually is.
I won't go into the details but suffice to say, make sure your user stories actually cover every major activity before going ahead with a change. To be slack on the user stories will bite you in the end as regression can lead to sleepless nights, so test early, and test often...
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