IMO, this is something we should do on presubmit if we can. This might be a bit different with official DEPS, though.

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I think that's a good idea, but a bit tricky -- recipes are in python, which means after executing 1 recipe (in simulation) AND if dependency wasn't used we can't be sure that dependency is never used. But, since we require coverage, perhaps we should analyze all tests for a recipe or recipe_module and then make 
a decision?