All the setup/teardown/pre/post/conditions template methods
now are required to return void. This was warned with phpunit 7
and now is enforced.
At the same time, fix a few wrong function names,
provider data and param types, return statements...
Expanded the unit tests to ensure unnecessary events are not
saved in the DB and altered existing tests so they pass with
the introduction of this feature.
Eloy Lafuente (stronk7)