tests

Rename classes and add compatibility shims. #1133

Job	Run time
test_cygwin (39, windows-latest)	3m 26s
test (3.8, ubuntu-latest)	40s
ci_setuptools (3.10, ubuntu-latest)	3m 27s
collateral (diffcov)	48s
test_msvc_python_mingw	2m 34s
collateral (docs)	28s
test (3.8, macos-latest)	1m 17s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 30s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 29s
test (3.8, windows-latest)	1m 38s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 30s
test (3.12, ubuntu-latest)	43s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 39s
test (3.12, macos-latest)	50s
test (3.12, windows-latest)	2m 22s
test (3.9, ubuntu-latest)	45s
test (3.10, ubuntu-latest)	37s
test (3.11, ubuntu-latest)	36s
test (pypy3.10, ubuntu-latest)	1m 31s
check	4s
release	0s
	27m 54s

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