unit tests

[keara-soloway]

Add unit tests for the CHAP module; integrate their execution with CI/CD.

• Enumerate testable entities
• Decide what metrics need to be tested on each one
• Implement

[vkuznet]

@keara-soloway , please see my initial PR #35 and extend it further.

[vkuznet]

The unittest should cover CHAP component functionality. The test/data area should be used to store test data of any form. And, test should check for data types, and internal data-flow.