Marc:
I've added tests of the exceptions that should be raised for several of the trigonometric and hyperbolic functions, exp, log, and sqrt, and a few more.
I see now that if I want to add files to the git repository, then "git diff" will not be enough to show which files are added. I guess if I want to do more, I'll need to learn a bit of git.
Here is a file containing the unit-tests directory after my changes.
Brad