When you do have to play all three roles (UI-designer, tester,
coder), the best approach is to do the UI-design first (on paper),
then write your unit tests, then write the code. In this way, you
risk the least cross-contamination of design and testing with the
actual coding. Obviously you still have to be conscious of your role
(don't think about implementation while designing the UI, just focus
on the UI). And, of course, it doesn't all have to be up-front. You
can do the same thing in an iterative fashion so long as you make
sure you follow the design,test,code steps in that order for each
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