Add basic unit test showcase

[Remi-Gau]

• adds a test that does not use Moxunit
• adds its equivalent moxunit based test
• includes the test data (realignement parameter)
• includes commented code to create the expected test data

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To do

• [x] add readme in tests folder

[jsheunis]

This is awesome! I'll probably have a look at this next week (29 March) once the intensity of OpenMR has cooled down :)