Add unit tests

[bramvdh91]

We want to test all basic components, hence a call to provide unit tests here.
The total pipe model is already tested in the validation examples, but maybe it is a good idea to add some basic additional tests?
Here's a list of components that would be good to test (we could base this on the existing examples in UseCases):

• PipeAdiabaticPlugFlow for standstill and reversing flow
• PipeCore for standstill and reversing flow
• TimeDelay component
• HeatLossPipeDelay (some ambiguous naming here too, maybe drop delay?)

[bramvdh91]

In addition, the unit tests that can be done now run into a lot of errors in pedantic mode and mostly fail to simulate. Any help here is welcome :)

[bramvdh91]

see branch pipe_issue74_unitTests

[bramvdh91]

Also cleaning up examples in this branch

[bramvdh91]

@marcusfuchs would you be able to help here? I'm trying to run unit tests on the Validation package, but I keep getting errors that cause the unit tests to fail (such as non-literal value, unspecified initial conditions,...)

[marcusfuchs]

@bramvdh91 You're right, it would be great to get rid of these errors. I hope I find the time to also look into this.

[bramvdh91]

@marcusfuchs I was able to remove the "non-literal values" by including dp(nominal=2) in the instantiation of the HydraulicDiameter res :) For the initial conditions, some more work is needed, but in any case now the Validation unit tests are running without problem.

[marcusfuchs]

Great!