tests

Extend documentation on environment variables #2333

Job	Run time
mypy	14s
msvc (3.11)	2m 43s
homebrew (3.8)	2m 3s
cygwin (3.9)	6m 19s
homebrew (3.11)	1m 56s
pyston (3.8)	1m 11s
test (ubuntu, 3.7)	1m 50s
test (ubuntu, 3.12)	1m 41s
test (macos, 3.7)	2m 31s
test (macos, 3.12)	2m 25s
test (windows, 3.7)	3m 17s
test (windows, 3.12)	4m 0s
test (ubuntu, pypy-3.9)	4m 20s
test (ubuntu, pypy-3.10)	4m 32s
test (ubuntu, 3.8)	1m 22s
test (ubuntu, 3.9)	1m 43s
test (ubuntu, 3.10)	1m 27s
test (ubuntu, 3.11, ~=0.63.3)	1m 32s
test (ubuntu, 3.11, ~=0.64.0)	1m 28s
test (ubuntu, 3.11, ~=1.0.0)	1m 31s
test (ubuntu, 3.11, ~=1.1.0)	1m 30s
test (ubuntu, 3.12, ~=1.2.3)	1m 49s
test (ubuntu, 3.12, @git+https://github.com/mesonbuild/meson.git)	1m 45s
test (windows, 3.12, @git+https://github.com/mesonbuild/meson.git)	4m 28s
	57m 37s

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