Ignore coverage in test code #1160

Job	Run time
collateral (diffcov)	5m 37s
test_cygwin (39, windows-latest)	17m 34s
collateral (docs)	1m 56s
test (3.9, ubuntu-latest)	4m 27s
test (3.9, macos-latest)	4m 32s
test (3.9, windows-latest)	11m 46s
test (3.13, ubuntu-latest)	5m 19s
test (3.13, macos-latest)	4m 7s
test (3.13, windows-latest)	14m 15s
test (3.10, ubuntu-latest)	4m 9s
test (3.11, ubuntu-latest)	4m 11s
test (3.12, ubuntu-latest)	5m 42s
test (3.14, ubuntu-latest)	6m 50s
test (pypy3.10, ubuntu-latest, stdlib)	16m 40s
test (ubuntu-latest, 3.10, stdlib)	4m 19s
integration-test	0s
check	4s
release	0s
	1h 51m 28s

Provide feedback