Please read the guidelines for contribution about signing off Developer's Certificate of Origin.

A pull-request submission must follow the format described below:

1. One or more commits that contain the test cases. These commits must appear first in the series of commits included in the pull request.
2. Commits that make the above tests pass, divided with a reasonable functional granularity.
3. Multiple minor fixes must be squashed into one commits.
4. No junk code is allowed, e.g., debugger statements / print.