Unit tests + Code coverage report

Fix `matrix.php-version` -> `matrix.php` for committing report #16

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Run time

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Job	Run time
unit-tests (7.3)	58s
unit-tests (7.4)	55s
unit-tests (8.0)	55s
unit-tests (8.1)	54s
unit-tests (8.2)	1m 15s
unit-tests (8.3)	1m 30s
	6m 27s