Convert from unittest.TestCase to py.test #41

Job	Run time
Build the documentation	42s
Validate coverage	46s
Lint the package	22s
Python: 3.7-x64 on ubuntu-latest	36s
Python: 3.7-x64 on windows-latest	1m 35s
Python: 3.7-x86 on windows-latest	1m 42s
Python: 3.7-x64 on macos-latest	1m 7s
Python: 3.8-x64 on ubuntu-latest	36s
Python: 3.8-x64 on windows-latest	1m 50s
Python: 3.8-x86 on windows-latest	1m 41s
Python: 3.8-x64 on macos-latest	50s
Python: 3.9-x64 on ubuntu-latest	30s
Python: 3.9-x64 on windows-latest	1m 39s
Python: 3.9-x86 on windows-latest	1m 47s
Python: 3.9-x64 on macos-latest	43s
Python: 3.10-x64 on ubuntu-latest	30s
Python: 3.10-x64 on windows-latest	2m 1s
Python: 3.10-x86 on windows-latest	1m 48s
Python: 3.10-x64 on macos-latest	54s
Python: 3.11-x64 on ubuntu-latest	33s
Python: 3.11-x64 on windows-latest	1m 23s
Python: 3.11-x86 on windows-latest	1m 44s
Python: 3.11-x64 on macos-latest	59s
Python: pypy-3.8-x64 on ubuntu-latest	1m 51s
Python: pypy-3.8-x64 on macos-latest	2m 42s
	30m 51s

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