test_container Helps to allow for testing of the http dependncy injection container at /src/app/sys/container.php
test_emailer Handles sending and formatting of individual e-mail messages through the configured SMTP servers on the system
test_http_requests Handles all remote HTTP requests that are sent via unit tests. Any HTTP requests sent to the /unit_test/* URI of the system will pipe into this library, calling the method of the first segment of the URI. For example, if sending to /unit_test/nexmo/.