Unit Tests

Refactor the `start` command and add unit tests #42

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Run time

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Job	Run time
unit_tests (pypy3.9)	29s
unit_tests (pypy3.10)	30s
unit_tests (3.9)	14s
unit_tests (3.10)	8s
unit_tests (3.11)	9s
unit_tests (3.12)	10s
	1m 40s