Tests *in* code?

One thing that one could do with Scheme macros is actually
write unit
tests *inside* the source code.  It'd be trivial to have a
test
harness which would take a module name, extract the tests
from the
module's source, and run them.  And the tests would act as
an
additional sort of documentation: runnable examples, built
right into
the source code.

What do you think?

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