Unit tests and coverage

Update codecov action #140

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Run time

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Job	Run time
build (3.7, ubuntu-latest)	32s
build (3.7, windows-latest)	1m 25s
build (3.8, ubuntu-latest)	31s
build (3.8, macos-latest)	53s
build (3.8, windows-latest)	1m 28s
build (3.9, ubuntu-latest)	27s
build (3.9, macos-latest)	44s
build (3.9, windows-latest)	1m 36s
build (3.10, ubuntu-latest)	27s
build (3.10, macos-latest)	32s
build (3.10, windows-latest)	1m 32s
build (3.11, ubuntu-latest)	27s
build (3.11, macos-latest)	32s
build (3.11, windows-latest)	1m 54s
build (3.7, macos-13)	1m 2s
	14m 2s