> The tests should not be byte compilation.  In fact, these files should be compiled by the build phase.

I see now that the emacs-build-system 'byte compiles all Emacs Lisp
files.' Then, I think the entire `(arguments ...)` can be elided. If
this is correct, I am resending the patch (see attachment). If not,
please direct me to some examples or explain in more detail how to
byte-compile the *.el file during the build phase. Thank you.

(FYI the code under #:test-command was from
https://github.com/purcell/color-theme-sanityinc-tomorrow/blob/d34e8db507ee0c7b465ff18a8f220c33ed77cd79/run-tests.sh)