Add coverage reports to py.test runner
Summary: Of note this now forces the pytest-cov plugin to be installed unless they turn it off.
Test Plan:
../arcanist/bin/arc unit COVERAGE REPORT 97% changes/models/test.py 100% tests/changes/api/serializer/models/test_testcase.py 100% changes/api/serializer/models/testcase.py UNIT OKAY No unit test failures. Updated an existing Differential revision: Revision URI: https://tails.corp.dropbox.com/D43387 Included changes: M changes/api/serializer/models/testcase.py M changes/models/test.py M tests/changes/api/serializer/models/test_testcase.py
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D8667