tests fail in appveyor for Python 3.5, 3.6 and 3.7

[videlec]

The master branch is also failing the testsuite on appveyor (see #1 where this has also been encountered). The problem is simply a non supported option of py.test

[command]/bin/bash --noprofile --norc /home/vsts/work/_temp/417b02aa-2ee9-4d00-becc-a515a96ad954.sh
py35 create: /home/vsts/work/1/s/.tox/py35
py35 installdeps: hypothesis, pytest, pytest-cov
py35 develop-inst: /home/vsts/work/1/s
py35 installed: atomicwrites==1.3.0,attrs==19.1.0,coverage==4.5.3,cypari==2.3.0,future==0.17.1,hypothesis==4.26.3,importlib-metadata==0.18,more-itertools==7.1.0,mpmath==1.1.0,packaging==19.0,pathlib2==2.3.4,pluggy==0.12.0,py==1.8.0,pyparsing==2.4.0,pytest==5.0.1,pytest-cov==2.7.1,-e git+https://github.com/MarkCBell/realalg@e8d0a0e722dec47bac02e502165f229f71faffe2#egg=realalg,six==1.12.0,sympy==1.4,wcwidth==0.1.7,zipp==0.5.1
py35 run-test-pre: PYTHONHASHSEED='294238053'
py35 run-test: commands[0] | py.test --hypothesis-profile=ci --duration=20 --junitxml=results.xml
ERROR: usage: py.test [options] [file_or_dir] [file_or_dir] [...]
py.test: error: unrecognized arguments: --duration=20
 inifile: /home/vsts/work/1/s/tox.ini
 rootdir: /home/vsts/work/1/s

ERROR: InvocationError for command /home/vsts/work/1/s/.tox/py35/bin/py.test --hypothesis-profile=ci --duration=20 --junitxml=results.xml (exited with code 4)

[MarkCBell]

Thank you very much for letting me know. The issue comes from py.test having recently switched from using the --duration flag to the --durations flag (although they don't appear to have documented this anywhere). Originally I caught this for travis but missed appveyor and azure. The same issue affected flipper and curver but all three have now had this fixed in their dev branches and the master will be updated at the weekend.