tests failing for py27qt5

[cpascual]

Even after fixing #1069, the py2qt5 tests are still failing. Now the problem seems related to pytest again.

A quick comparison shows that the tox conda environments have different versions of pytest, being the py2qt5 the one with the oldest pytest version:

• py27qt4 -->pytest==4.6.4,pytest-xvfb==1.2.0
• py27qt5 -->pytest==3.2.2,pytest-xvfb==1.2.0
• py35qt5 -->pytest==3.8.1,pytest-xvfb==1.1.0
• py36qt5 --> pytest==5.3.5,pytest-xvfb==1.2.0
• py37qt5 --> pytest==5.3.5,pytest-xvfb==1.2.0
• py37ps2 --> pytest==5.3.5,pytest-xvfb==1.2.0

Maybe forcing a higher version of pytest in py27qt5 could help?

Also, if this is not fixed promptly, at least the py27qt5 test should be "allowed to fail" to facilitate the CI

[cpascual]

This thread seems to confirm the suspicion.

It seems that forcing pytest to >=3.6.3 should fix it