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

从 testing/test_xspec.py::TestMakegateway::test_popen_nice 以及失败信息中显示的 makegateway("popen//nice=5") 路径开始。在 Python 3.5 或 Debian 环境中重现该测试，检查 popen nice 选项的处理方式，并确认该测试能够可靠通过，同时不破坏现有的 popen 行为。