Improve Unittests Coverage

[thealphadollar]

Is your feature request related to a problem? Please describe.
Nephos currently has about 80% unit tests coverage, which is good but not enough for a client which demands full automation.

Describe the solution you'd like
One should get themselves comfortable with the current tests (which use unittest module from python and pytest) and then using the coverage report sought to add more unittests in the same pattern as the current ones.

Describe alternatives you've considered
None.

Additional context
Please refer to this for guide on how and why to write unit tests. A test coverage of >90% is desirable.