Unit tests for annotation features

[rcastelo]

Increase the percentage of test coverage of the source code, by writing additional unit tests.

[jimrothstein]

@rcastelo I could help write unit tests, but I do not see any now.

[rcastelo]

Hi, currently available unit tests are in the directory https://github.com/rcastelo/GSVA/tree/devel/inst/unitTests

[jimrothstein]

I can follow the unitTests and R code, but not the biology. (Tried to go through one of your papers, https://pubmed.ncbi.nlm.nih.gov/23323831/)

With some direction, I think I could be useful with testing code and/or the API. If you suggest one or two specific tests/code to add or improve, I would be happy to give a try.
jim