Organising assemblies, classes, interfaces in C#
More on Mocks and the Moq library:
https://msdn.microsoft.com/en-us/libr...
https://github.com/Moq/moq4/wiki/Quic...
http://www.c-sharpcorner.com/uploadfi...
http://www.developerhandbook.com/unit...
And for more on assemblies, classes and just about everything to make you an amazing programmer, read everything by Robert C Martin:
The Clean Coder: http://amzn.to/2r56LHc
Agile Principle, Patterns and Practices in C#: http://amzn.to/2rZ1noa
Working Effectively with Legacy Code: http://amzn.to/2rEHQZH
(Affiliate links)