Test coverage again

Author: oschwald

.travis.yml

@@ -19,13 +19,13 @@ before_install:
   - sudo make install
   - sudo ldconfig
   - cd ..
-  - pip install coveralls
+  - pip install coverage coveralls
   - if [[ $TRAVIS_PYTHON_VERSION == '3.6' ]]; then pip install pylint yapf; fi
   - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install unittest2; fi
 
 script:
   - if [[ $TRAVIS_PYTHON_VERSION != 'pypy' ]]; then export MM_FORCE_EXT_TESTS=1; fi
-  - CFLAGS="-Werror -Wall -Wextra" python setup.py test
+  - CFLAGS="-Werror -Wall -Wextra" coverage run --source maxminddb setup.py test
   - if [[ $TRAVIS_PYTHON_VERSION == '3.6' ]]; then pylint --rcfile .pylintrc maxminddb/*.py; fi
   - if [[ $TRAVIS_PYTHON_VERSION == '3.6' ]]; then ./.travis-yapf.sh; fi