Feat/tests

[dorianim]

This PR adds some unittests. They are meant to test the intended functionality of the code but do not test it in a real scenario, only by using mocks (otherwise it would be integration tests).

Codecov:

Fixes #36

Needs to be tested:

• [X] computer
• [X] environment
• [X] fileHelper
• [X] gpo
• [X] hooks
• [ ] imageHelper
• [ ] keytab
• [ ] ldapHelper
• [X] localUserHelper
• [x] logging
• [x] printers
• [x] realm
• [ ] setup
• [ ] shares
• [X] templates
• [X] user

Not tested for now:

• config, as it will be refactored in #32

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[codeclimate[bot]]

Code Climate has analyzed commit cf60b957 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

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