Run tests with runtests about pysm_public

[rainwoodman]

Yes. If you decorate a test with MPITest, then it will be tested with a bunch of communicators.
If you don't then it will be run symmetrically on on ranks.

Some examples are in:

https://github.com/rainwoodman/pmesh/tree/master/pmesh/tests

test-domain is fully of MPI tests. test-window is full of non-mpi tests. (You can also mix them in the same file, but that's probably not a good design decision).

The other 'feature' of run-tests.py is that it forces you to make sure the package is fully installable; it installs before testing.

Therefore for finding the tests, you must specify how to install them in setup.py. I find it easiest to install the tests as a subpackage of the main package. e.g. https://github.com/rainwoodman/pmesh/blob/master/setup.py#L49

(don't forget init.py)

There are other "cleaner" ways to install the tests, e.g. with a MANIFEST.in file, but more troublesome.

I shall add some information about this in README.

[zonca]

implemented in #18