== The test suite ==
This step is normally performed as step number 1first. This is the most important part that makes sure that the code not only works now, but will continue working for the entire lifetime of the relax project.
The idea is that real or synthetic data, for example as Sparky peak lists, is obtained or created for the model and added to the test suite directory test_suite/shared_data/dispersion/. This is then used in a system test to check that the code in relax can reproduce the data.