pytest: package conftest

[oliver-sanders]

closes #563

• Package the conftest file.
• This changes the test command to pytest jupyter_server.
• Import the jupyter_server.conftest in the examples to inherit the plugin.

[codecov-commenter]

Codecov Report

Merging #576 (b6c2fb2) into master (e3a146e) will increase coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
+ Coverage   77.34%   77.69%   +0.35%     
==========================================
  Files         109      110       +1     
  Lines       10137    10234      +97     
  Branches     1093     1111      +18     
==========================================
+ Hits         7840     7951     +111     
+ Misses       1908     1896      -12     
+ Partials      389      387       -2     

Impacted Files	Coverage Δ
jupyter_server/conftest.py	76.92% <ø> (ø)
jupyter_server/tests/services/kernels/test_api.py	96.93% <0.00%> (-2.05%)	⬇️
jupyter_server/tests/extension/test_manager.py	100.00% <0.00%> (ø)
jupyter_server/services/kernels/kernelmanager.py	82.87% <0.00%> (+1.02%)	⬆️
jupyter_server/terminal/terminalmanager.py	87.50% <0.00%> (+1.25%)	⬆️
jupyter_server/extension/application.py	74.31% <0.00%> (+1.37%)	⬆️
jupyter_server/services/kernels/handlers.py	63.35% <0.00%> (+1.57%)	⬆️
...pyter_server/tests/extension/mockextensions/app.py	93.93% <0.00%> (+3.03%)	⬆️
jupyter_server/extension/manager.py	93.44% <0.00%> (+3.63%)	⬆️

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[oliver-sanders]

• Windows tests failing as expected.
• MacOS PyPy tests failing at the installation phase trying to build pyzmq.

[blink1073]

Bumping to pick up the CI fixes from #571

[blink1073]

Thank you!

[Zsailer]

Thanks, @oliver-sanders. 👍