This great article by @GeePawHill explains one
of the tricks when TDDing "big ideas": split them into small, easily testable
things:
https://www.geepawhill.com/2019/07/26/tdd-pro-tip-make-hard-problems-collections-of-toy-problems/
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Doing that will also enable you to iterate faster on various mutations of the
big idea, existing working parts can be recombined with little effort. Because I
have the confidence that the small things keep working, I can focus on the
bigger picture.