Constructor params for test fixtures #1
Description
Currently test fixtures are constructed using parameterless constructor, which makes passing any parameters inside onerous. Everything in the call chain between rl::simulate() and call to constructor is templated on test fixture type, so it should be possible to template it on constructor parameters, too, and pass them along.
Passing mutable parameters would be obviously a bad idea, and it's impossible to detect that automagically. Perhaps we could warn in some common cases?