Workaround lisp-unit error
Replace tests with 'let in them that were causing test-time compile errors. This is apparently due to an error in lisp-unit https://github.com/OdonataResearchLLC/lisp-unit/issues/41#issuecomment-336667648. Workaround is to use assert-equal; as fringe benefit, this is now a more accurate result, rather than simply being non-nil, the actual result is checked.
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