Reduce Duplication between ACMachineTest and MachineTest

[baldawar]

Tracking ticket to follow up on #82 (comment)

What I have been doing recently is added rulesForJSONEvent tests to ACMachineTest and adding rulesForEvent tests (otherwise identical) to MachineTest. I think that is the intended difference between the two test classes? So change this and add a version to ACMachineTest? Of course, we should probably think through a path forward to stop duplicating all tests.

Need to

• combine tests cases (some are missing from ACMachineTest and others are lacking in MachineTest)
• build a wrapper method to call both rulesForJSONEvent and rulesForEvent
• handle cases when both should be returning different results for Array Consistency.