[ovirt-devel] [VDSM] Coverage - checking coverage with vdsm-coverage

[Nir Soffer]

Hi all,

I posted https://gerrit.ovirt.org/49807, adding vdsm-coverage package, making
it easy to get coverage report for functional or system tests. This can also be
used to understand which code is touched when performing some flow manually.

Once this patch is merged, you can create coverage report like this:

1. Install vdsm-coverage
2. Enable coverage in vdsm.conf:

[devel]
coverage_enable = true

3. Restart vdsm
4. Run tests or interact with engine
5. Stop vdsm

The report is created in /var/run/vdsm/vdsm.coverage

To create html report:

    coverage html --rcfile /etc/vdsm/coverage.conf

The view the report, start a web server:

    cd htmlcov
    python -m SimpleHTTPServer

The report is available now in your favorite browser:

   http://myhost.example.com:8000/

The manual steps described above can probably be automated, having
a web server running and generating coverage report on demand.
(hint: patches are welcome)

Notes:

- On RHEL 7.2, python-coverage is old (3.6). Use pip to install
  more recent one:

      pip install -U coverage

  Note that files generated by coverage 3.6 cannot be processed
  with coverage 4.

- Needs debian packaging

Please try and suggest improvements.

Nir