+Running the unit tests requires the python packages ``tox`` and ``pytest``.
+
+The RMR library is also required during unit tests. If running directly from tox
+(outside a Docker container), install RMR according to its instructions.
+
+Upon completion, view the test coverage like this:
+
+::
+
+ tox
+ open htmlcov/index.html
+
+Alternatively, if you cannot install RMR locally, you can run the unit
+tests in Docker. This is somewhat less nice because you don't get the
+pretty HTML report on coverage.