Running tests with pytest.

.travis.yml

@@ -4,8 +4,11 @@ python: 3.6
 install:
    - export TEST_ENV=true
    - ./startup.sh
-   - pip install python-coveralls
+   - pip install pytest
+   - pip install pytest-cov
+   - pip install coveralls
 script:
-   - coverage run tests/runtests.py
+   - pytest tabpy-server/server_tests/ --cov=tabpy-server/
+   - pytest tabpy-tools/client_tests/ --cov=tabpy-tools/
 after_success:
    - coveralls