Debsources' test coverage is decent:

  /srv/debsources$ nosetests --with-coverage debsources/ -v --cover-package=debsources
  [...]
  /srv/debsources$ python-coverage report
  Name                                            Stmts   Miss  Cover
  -------------------------------------------------------------------
  debsources/__init__                                 2      0   100%
  debsources/app/__init__                             2      0   100%
  debsources/app/app_factory                         40      3    93%
  debsources/app/extract_stats                        9      0   100%
  debsources/app/forms                                5      0   100%
  debsources/app/infobox                             54     11    80%
  debsources/app/pagination                          20      1    95%
  debsources/app/sourcecode                          71     32    55%
  debsources/app/views                              342     67    80%
  debsources/archiver                               104     22    79%
  debsources/charts                                  42     30    29%
  debsources/consts                                   9      0   100%
  debsources/dbutils                                 51      1    98%
  debsources/debmirror                              128     34    73%
  debsources/excepts                                 16      0   100%
  debsources/filetype                                58     23    60%
  debsources/fs_storage                              68     20    71%
  debsources/hashutil                                20      8    60%
  debsources/local_info                              17      3    82%
  debsources/mainlib                                145     77    47%
  debsources/models                                 328     25    92%
  debsources/plugins/__init__                         0      0   100%
  debsources/plugins/hook_checksums                  73      7    90%
  debsources/plugins/hook_ctags                      99     14    86%
  debsources/plugins/hook_hello                      10     10     0%
  debsources/plugins/hook_metrics                    51      0   100%
  debsources/plugins/hook_sloccount                  70      7    90%
  debsources/sqla_session                             8      0   100%
  debsources/statistics                             157     35    78%
  debsources/subprocess_workaround                    3      1    67%
  debsources/tests/__init__                           0      0   100%
  debsources/tests/db_testing                        43      4    91%
  debsources/tests/test_archiver                    118      0   100%
  debsources/tests/test_stats                        71      0   100%
  debsources/tests/test_updater                     164      8    95%
  debsources/tests/test_webapp                      153      1    99%
  debsources/tests/testdata                           4      0   100%
  debsources/tests/updater_testing                    6      0   100%
  debsources/updater                                318     69    78%
  -------------------------------------------------------------------
  TOTAL                                            2879    513    82%

But still short of 100%, which is required to give some basic guarantees
of code well-formedness.

Please increase (and/or maximize to 100%) Debsources' test coverage.

FWIW, the first command shown above will give hints of the lines of code
which are currently not exercised by the test suite. Patches that add
new tests touching those lines are more than welcome.

Cheers.

Attached is a patch adding tests for debsources.filetype. They were all
created from Matthieu's assertions in __main__.

I'm not sure whether I was right to create a new file and a new attribute
('filetype') for these tests; I'll amend the commit according to your
comments.

filetype.py's coverage went from 80% to 96%.

The patch is also available here:
https://github.com/clemux/debsources/commit/a946736342b945da393216879f5b27a2baa499ca

Thanks, this change is welcome: we'd like to have all tests under
debsources/tests/, and if there are still tests under __main__ they
should be moved there.

I've applied your patch, modulo some changes to the license/copyright
header, whose style has been improved concurrently with your patch.

Cheers.

Attached is a patch adding tests for debsources.fs_storage, whose
coverage is now 95% (formerly 70%), as well as a patch adding tests for
debsources.hashutil, whose coverage is now 100% (formerly 71%).

It might be a good idea to set the attribute of test_filetype,
test_fs_storage and test_hashutil to 'utils' instead of a separate
attribute for each of the test sets.

Thanks, I've merged and pushed both your patches --- with only minor
changes: correct copyright year in the header and commit message style,
for consistency with the Git history. (Have a look at the interdiff.)

I don't understand what do you mean with this. But if you think it's
relevant enough (I guess I don't), feel free to send a separate patch
about this.

Cheers.