installs tests, but they rely on paths in source directory

[Jelmer Vernooij]

subunit installs its tests, which is useful - it can be run by autopkgtest.

However, /usr/lib/python2.7/dist-packages/subunit/tests/test_subunit_filter.py:308 relies on the fact that the tests are run from the source tree, as it tries to locate the filters.

I've verified that this can be fixed by simply passing in the right location to filter-subunit. That's not the correct fix though. The only reasonable thing I can think of is to have it check for ../../../filters/filter-subunit first, and if that doesn't exists, falling back to /usr/bin/filter-subunit or ../../../../../../bin/filter-subunit.

Is there any option that seems better?

[Robert Collins (lifeless)]

its test code, I'm not too worried about clean here, working is the important thing ;)