[racket] Price of RackUnit

I find myself doing stuff like...

#lang racket
(require rackunit)
(provide my-function ...)

; My code

(define (my-function ...) ...) ...

; My tests ...

(check* ...) ... ; * in the wildcard sense

... so that I never evade testing my code. Does another developer end up
testing my code? A user?
In other words, if I don't export the test code via *require*, what gets
executed by importers? of source? of executables?
IMHO, even if the answer is "all of it", it's worth it, but the answer may
affect how tests are written.

Pat
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