links are broken 😞

I edited to point to the page for the job instead - links to logs seem to be weirdly user and browser specific.

links are still broken :(

Oops - fixed now, I believe (at least, they work for me).

Looks similar to #8679? Can you check if $DISPLAY is set (both during test collection and when the test is run)?

For reference, here is the error (same in both runs):

[gw0] darwin -- Python 3.6.0 /Users/travis/build/MacPython/matplotlib-wheels/venv/bin/python3.6
backend = 'tkagg'

    @pytest.mark.parametrize("backend", _get_testable_interactive_backends())
    def test_backend(backend):
        environ = os.environ.copy()
        environ["MPLBACKEND"] = backend
        proc = Popen([sys.executable, "-c", _test_script], env=environ)
        # Empirically, 1s is not enough on Travis.
>       assert proc.wait(timeout=5) == 0

This doesn't happen in every Python 3.6 run - it has passed a couple of times before failing again.

I think DISPLAY must be set, given the the fix to #8679.

Does explicitly unsetting $DISPLAY in .travis.yml's before_script (in the osx case) help?

https://travis-ci.org/MacPython/matplotlib-wheels/jobs/245278596

This seems related to Travis which is no longer used. If the same problem exists on other CIs, feel free to reopen.