[Feature Discussion] Wannier90 support about sumo

[ajjackson]

This seems reasonable. Will it be easy to test?

[oashour]

I guess most of the unit tests would sit in whatever package I end up writing to handle the actual parsing of the Wannier90 calculations, it would be an identical situation to the proposed Quantum ESPRESSO support. I guess it would be tested the same way sumo would test plotting from any other code, but I don't think there are any plotting-specific unit tests in sumo right now.

(I actually have no idea how to write plotting-specific unit tests, Julia's Plots.jl has this idea of plotting recipes that I used when unit testing Julia plots, but I don't know if matplotlib has anything similar).

[ajjackson]

Plot testing is really hard! There is at least one package out there for matplotlib that tries to normalise the less predictable parameters (screen resolution etc), save images and then compare them.

For Sumo tests we don't render the plot but have a poke around the ax.lines etc. to see if the data looks correct.

As more code interfaces are added it doesn't make sense to test the actual plots; we should just check the data that makes it to a plotter.