Google Code-in

Snapcraft builds snap packages. The source code for the packages can be downloaded from various sources. The module that handles the sources is 80% covered by unittests. We need to increase the coverage closer to 100%.

About snapcraft: https://developer.ubuntu.com/en/snappy/build-apps/

The source file: https://github.com/ubuntu-core/snapcraft/blob/master/snapcraft/source.py

About unittests for python: https://docs.python.org/3/library/unittest.html