Add test runner to Travis

.travis.yml

@@ -20,8 +20,9 @@ before_script:
   - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
   # 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
+  - pip install pytest
 script:
-  - true  # add other tests here
+  - python runtest.py
 notifications:
   on_success: change
   on_failure: change  # `always` will be the setting once code changes slow down