3297 - run unit tests before scenarios

I've been putting up for some time with the tension between wanting to
show scenarios at the top of the layer even if I want to *run* any unit
tests of sub-components introduced within the layer before them. Turned
out to be an easy fix.

We don't have very many of these, and the unit tests in the early layers
don't compete with any scenarios, so I don't need to mess with them. But
this is a key tool in my toolkit, to be able to decouple presentation
order from run order for tests.

Though now the separate compilation units are again unbalanced; sigh.

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