testing/test_xspec.py::TestMakegateway::test_popen_nice FAILED

• Bitbucket: https://bitbucket.org/hpk42/execnet/issue/54
• Originally reported by: @danstender
• Originally created at: 2017-03-19T18:20:53.165

Another test failure from Debian packaging. This one belongs to the same class as #53 (randomly appearing).

testing/test_xspec.py::TestMakegateway::test_popen_nice FAILED
=================================== FAILURES ===================================
_______________________ TestMakegateway.test_popen_nice ________________________

self = <test_xspec.TestMakegateway object at 0x7f57cbff97b8>
makegateway = <bound method Group.makegateway of <Group ['gw1']>>

    @pytest.mark.skipif("not hasattr(os, 'nice')")
    def test_popen_nice(self, makegateway):
        gw = makegateway("popen")

        def getnice(channel):
            import os
            if hasattr(os, 'nice'):
                channel.send(os.nice(0))
            else:
                channel.send(None)
        remotenice = gw.remote_exec(getnice).receive()
        gw.exit()
        if remotenice is not None:
            gw = makegateway("popen//nice=5")
            remotenice2 = gw.remote_exec(getnice).receive()
>           assert remotenice2 == remotenice + 5
E           assert 0 == (0 + 5)

testing/test_xspec.py:136: AssertionError

This one comes up when testing on Python 3.5. Build log: https://people.debian.org/~sanvila/build-logs/execnet/execnet_1.4.1-3_amd64-20170207T152032Z.
Thanks for hints,
DS

Start with testing/test_xspec.py::TestMakegateway::test_popen_nice and the makegateway("popen//nice=5") path shown in the failure. Reproduce the test on Python 3.5 or the Debian environment, inspect how the popen nice option is handled, and confirm the test passes reliably without breaking the existing popen behavior.