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:

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

Not tested for now:

• config, as it will be refactored in Consolidate config file #32

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[codeclimate]

Code Climate has analyzed commit cf60b95 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

View more on Code Climate.