Testing Backward-Incompatible Changes

Let’s say one day you decide to add a feature to your software or service. For example, you need a new flag on user accounts, so that different types of users get different features. (These don’t even have to be tiered account levels; maybe accounts of type “music lover” get a widget in the sidebar with suggestions for bands they might like while “sports fan” accounts get a sports scores widget instead.)

So, following good software development processes, you first write a couple of tests:

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