- added hook support (executed after parsing config but before starting
engine)
- made db resets configurable
- merged config parsing helper with the main Setup function
- renamed TestEnvironment.Setup -> TestEngine.Run as it represents the
setup for a single cgr-engine instance
- removed engineDelay parameter. Added helper to wait up to 200ms for
the APIerSv1 service to be up and running to prevent 'can't find
service' errors.
- replaced t.Log with t.Error for engine process kill error
- improved option comments
