Does the "test" command in interactive mode pick up the latest changes
in source?

Here's a workaround; you can paste this in project.clj or in your own
hook file until the fix is released:

(require 'robert.hooke 'leiningen.test)

(robert.hooke/add-hook #'leiningen.test/form-for-testing-namespaces
                       (fn [f namespaces & args]
                         `(do (doseq [n# '~namespaces] (require n# :reload))
                              ~(apply f namespaces args))))

If you need code to be reloaded from src/ then you'll need to put
:reload in the appropriate require/use clauses in your test ns forms.

thanks for reporting,
Phil