Fix coverage #124

Job	Run time
lint	1m 9s
build-docs	23s
build-package	35s
unit-test (3.10, macos-latest)	44s
unit-test (3.10, ubuntu-latest)	1m 8s
unit-test (3.11, macos-latest)	28s
unit-test (3.10, windows-latest)	1m 17s
unit-test (3.12, macos-latest)	33s
unit-test (3.11, ubuntu-latest)	1m 10s
unit-test (3.12, ubuntu-latest)	1m 18s
unit-test (3.12, windows-latest)	1m 50s
unit-test (3.13, macos-latest)	29s
unit-test (3.13, windows-latest)	2m 2s
unit-test (3.9, macos-latest)	42s
unit-test (3.13, ubuntu-latest)	1m 16s
unit-test (3.9, ubuntu-latest)	1m 5s
unit-test (3.9, windows-latest)	1m 10s
unit-test (pypy-3.10, macos-latest)	1m 21s
unit-test (pypy-3.10, ubuntu-latest)	1m 37s
unit-test (pypy-3.10, windows-latest)	2m 50s
Indicate completion to coveralls.io	15s
	23m 22s

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