might be related to https://github.com/pantsbuild/pants/pull/7522 Got the following:

./pants test tests/python/pants_test/backend/project_info/tasks:: 
...
21:50:25 00:25     [pytest]
                   Invalidated 6 targets.
                   scrubbed PYTHONPATH=/Users/yic/workspace/pants/src/python: from py.test environment
21:50:25 00:25       [run]
                     Failed to find compatible interpreter for constraints: ['CPython==3.6.1']
                     
                   tests/python/pants_test/backend/project_info/tasks:dependencies                 .....   NOT RUN

that looks to me like it wasn't able to invoke pytest at all, since that PR only affects whether

clean-all

happens to be run before a

self.run_pants()

command. integration tests should be running in a new buildroot, so i would think this wouldn't happen -- if that was wrong, then the PR should be reverted. i've continued to have to hack my pexrc file to address this issue when running tests, although isort and pythonstyle now don't require screwing around with the pexrc file, which is great. i think the interpreter location code for PytestRun probably needs to be updated to use whatever code was able to fix isort and pythonstyle. if hacking your pexrc (i just comment mine out) allows the tests to run, that would imply there's a hopefully simple fix to pytest interpreter location

it happens locally. tested with and without the commit, both failed

ah ok

good idea. let me try

ok, great! i think i know how to repro and working on fixing this. i thought the pex change which fixed lint and isort would fix this too