Unit tests

Use OTF2 lib for testing #390

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Run time

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Job	Run time
build (3.13)	3m 59s
build (3.10)	1m 41s
build (3.9)	2m 16s
build (3.11)	2m 22s
build (pypy-2.7)	2m 37s
build (3.12)	2m 37s
build (pypy-3.7)	4m 8s
build (pypy-3.11)	1m 59s
build (pypy-3.10)	1m 42s
build (pypy-3.8)	3m 5s
build (pypy-3.9)	3m 42s
	30m 8s