IronJacamar/Embedded is targeted against resource adapter development - e.g. the end result is a .rar. The environment helps with testing that it will work once deployed to a JCA container; IronJacamar/Standalone, AS7, whatever.
If you have more than just a .rar you will need the AS7 Arquillian environment. But why would you need to Mock stuff ? Maybe take a look at how HornetQ's resource adapter is integrated / tested in AS7.