openssl.libcrypto.tests: BIO_free should be called to release connections
smtp.tests: send-mail should be called to get the mock-smtp-server to terminate
db.tester: with-disposal needed to release the db connections in the pool
lists.lazy.tests: plugs file descriptor leak
webapps.mason.backend.tests: change db filename to mason-test.db to
avoid interference from other tests
graphviz.render.windows: need to return with the whole path in case
graphivz directory is not in PATH