Regression tests

Rename `eq` method to `equiv` to avoid confusion with `Equilibrium` #4133

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Run time

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Job	Run time
regression_tests (3.10, 1)	21m 33s
regression_tests (3.10, 2)	5m 48s
regression_tests (3.10, 3)	16m 16s
regression_tests (3.10, 4)	32m 51s
regression_tests (3.10, 5)	39m 31s
regression_tests (3.10, 6)	24m 38s
	2h 20m 37s