tests

wip #79

Job	Run time
test (3.8, ubuntu-latest)	54s
test (3.8, macos-latest)	56s
ci_setuptools (3.10, ubuntu-latest)	3m 50s
test_cygwin (39, windows-latest)	4m 54s
test (3.8, windows-latest)	40s
collateral (diffcov)	48s
collateral (docs)	34s
test (3.12, ubuntu-latest)	44s
test_msvc_python_mingw	2m 46s
test (3.12, macos-latest)	50s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	2m 13s
test (3.12, windows-latest)	41s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 29s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	2m 18s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	2m 22s
test (3.9, ubuntu-latest)	43s
test (3.10, ubuntu-latest)	55s
test (3.11, ubuntu-latest)	38s
test (pypy3.10, ubuntu-latest)	55s
check	3s
release	0s
	30m 13s

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