Unit tests for the CALS package. Usage:
$ export TEXINPUTS=`pwd`/../cals:
$ python support/run_tests.py
or, to execute a subset of the tests,
$ python support/run_tests.py cell/test_10
Expect that the tests in the directory "visual_tables" fail.
Depending on the OS and TeX distro version, the font drawing
might look different.
Probably I need to package the unit testing code as a separate
package and publish an article about it.