Add the new unittests to the Travis CI runs.

Add @hoadlck unittests.

.travis.yml

@@ -19,7 +19,7 @@ before_script:
   # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
   - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 script:
-  - true  # add other tests here
+  - python3 -m unittest tests.all --buffer --verbose
 notifications:
   on_success: change
   on_failure: change  # `always` will be the setting once code changes slow down