Implement tests for crowducate

[sebbel]

Related #136

Currently there are no tests for the crowducate software. With tests (or Test Driven Development) it would be easier to implement features and spot bugs, that might be hidden.

As a developer, I would like to write tests and test my application against them to ensure the functionality of the software's features

[sebbel]

Tasks

• Find a testing framework
• Identify sub-parts and divide the project in several of those sub-parts
• Create an Issue for each sub-part and implement tests for that sub-part.

Candidates for test suits:

• TinyTest
• Velocity
• ...