Add aries-basic-controller unit tests

[TTitcombe]

Description

Unit test the simple behaviour of aries-basic-controller. Create a tests folder to store them in

Type of Test

• [X] Unit test (e.g. checking a loop, method, or function is working as intended)
• [ ] Integration test (e.g. checking if a certain group or set of functionality is working as intended)
• [ ] Regression test (e.g. checking if by adding or removing a module of code allows other systems to continue to function as intended)
• [ ] Stress test (e.g. checking to see how well a system performs under various situations, including heavy usage)
• [ ] Performance test (e.g. checking to see how efficient a system is as performing the intended task)
• [ ] Other...

[wip-abramson]

This would be great to have. I spoke to the ACA-Py folks and to test we have to be running a real ACA-Py instance. They generally run tests within some Docker environment.

[lohanspies]

This is a good start for the test harness. "Yes. You can look at the Aries Agent Test Harness (https://github.com/hyperledger/aries-agent-test-harness) to test that. But lots of people are using the two together, including the main mobile apps -- Trinsic, esatus and Lissi." - from Stephen in Rocketchat