Travis CI Python 3.6 errors for Apertium Lint

[jayvdb]

There are now five builds on Travis CI Python 3.6 which all have a problem with ApertiumLintBearTest.test_run, which isnt occurring on Circle CI

https://travis-ci.org/coala/coala-bears/jobs/246104800
https://travis-ci.org/coala/coala-bears/jobs/246287726

https://travis-ci.org/jayvdb/coala-bears/jobs/246104306
https://travis-ci.org/jayvdb/coala-bears/jobs/246271994
https://travis-ci.org/jayvdb/coala-bears/jobs/246287712

=================================== FAILURES ===================================
________________________ ApertiumLintBearTest.test_run _________________________
self = <tests.apertium.ApertiumLintBearTest.ApertiumLintBearTest testMethod=test_run>

    def test_run(self):
        self.section.append(Setting('apertiumlint_config', ''))
        self.check_validity(self.uut, [], self.good_file)

        self.section.append(Setting('apertiumlint_config', self.config_file))
        self.check_validity(self.uut, [], self.good_file)

        self.section.append(Setting('apertiumlint_config', ''))
>       self.check_validity(self.uut, [], self.bad_file, valid=False)

tests/apertium/ApertiumLintBearTest.py:30: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../../../virtualenv/python3.6.0/lib/python3.6/site-packages/coalib/testing/LocalBearTestHelper.py:92: in check_validity

    settings=settings,

../../../virtualenv/python3.6.0/lib/python3.6/site-packages/coalib/testing/LocalBearTestHelper.py:132: in check_invalidity

    self.assertNotEqual(len(bear_output), 0, msg=msg)

E   AssertionError: 0 == 0 : The local bear 'ApertiumLintBear' yields no result although it should.

[jayvdb]

https://pypi.python.org/pypi/apertium_lint is still 0.4 from 2017-04-10, so that isnt the source of the problems.

The failing builds are all Python 3.6.0 , released 2016-12-23, so that shouldnt be the source of new failures.

[jayvdb]

It first occurred on https://travis-ci.org/coala/coala-bears/jobs/246009446#L3688 , 19 hours ago. That uses coala-0.12.0.dev20170622121840-py34.py35.py36-none-any.whl

The previous build, green, was coala-0.12.0.dev20170614091755-py34.py35.py36-none-any.whl , so if it was upstream in coala it occurred between 20170614 and 20170622 . There are only a few commits in that time period, and none looks especially related. Also it is strange that only this one test on one version of Python is failing.

[jayvdb]

Using Python 3.6.1 fixes the problem: https://travis-ci.org/jayvdb/coala-bears/builds/246319406 :/

[jayvdb]

This appears to be related to the newly launched Trusty images https://blog.travis-ci.com/2017-06-21-trusty-updates-2017-Q2-launch , as the previous green build was using the old image, and the erroring builds mentioned above all use the new workers.