Tests

[stefanhenneking]

Add more unit and integration tests to hp3D.

Related PRs:

• Fortran style #75 (cleans up test/ and sets up test/makefile)
• h-adaptive tests for distributed hexa meshes #106
• Unit tests for utilities #107
• Adding convergence tests for H1 and H(curl) problems #122
• Adding unit test for dumpin/dumpout routines #150
• Continuous Integration via GitHub Actions #159
• Fix various compiler warnings #169

[jedbrown]

It would be wonderful to hook these tests up to GitHub actions (or other continuous integration).

[stefanhenneking]

Thanks for the suggestion, @jedbrown. It's on our TODO list but so far no one's worked on it (personally I don't have much experience setting up GitHub actions for packages with lots of dependencies). I've now opened #155 to keep track of any CI efforts specifically.

[jedbrown]

It's likely to come up in review. Peter works on deal.II, which uses the approach of creating a Docker image with all dependencies and using that from Actions. https://github.com/dealii/dealii/blob/master/.github/workflows/linux.yml#L40
An alternative is to install dependencies using a package manager (such as apt install) from the script.

[stefanhenneking]

I figured that installing dependencies from script we'd probably run out of free minutes on GitHub fairly quickly. But I'll look into the option with the Docker image - thanks for the suggestion.

[stefanhenneking]

Added CI in #159