Unit tests for caliper-cli

[davidkel]

caliper-cli has no unit tests at all
New tests should not assume that the code is actually correct. It's expected that if the tests finds bugs or relevant situations where unexpected behaviour occurs then the code should also be fixed.

[Sayalikukkar]

@davidkel , Can you assign this task to me

[davidkel]

@Sayalikukkar Done.

[rahat2134]

Hi @davidkel can you elaborate more on this issue? Want to give it a try.