> In other cases I pretty much write my tests more or less randomly before, at the same time, or after the implementation. Similar most of the time. Once I kno

> In other cases I pretty much write my tests more or less randomly before, at the same time, or after the implementation. Similar most of the time. Once I know the interfaces have settled down and the problem you're solving is now well understood it feels like a better time to write tests. Once you have a feel for which parts are most error-prone as well you can concentrate on tests which have the most benefit.