Prepare a repository for use with testing:
$ ./mailer-init.sh
(make sure the subversion bindings are installed; this is not normal; see Ubuntu package “python3-subversion”)
The above creates a test repository named mailer-init.12345 (whatever PID). You can now run the test using:
$ ./mailer-t1.sh mailer-init.12345/repos/ ../mailer.py
TBD: discuss mailer-t2.sh
TBD: discuss mailer-t3.py