Test suite: get rid of the JRuby mess
We want to drop the dependency of JRuby from our automated test suite, and move to native Ruby.
See the blueprint.
Blueprint: https://tails.boum.org/blueprint/test_suite_getting_rid_of_the_jruby_mess/
Feature Branch: test/rjb-migration
Parent Task: #6315 (closed)
Subtasks
Original created by @tails on 5731 (Redmine)