Tests

update fitting tests #393

Job	Run time
run-tests (matrix, base, ubuntu-latest, 3.9, false)	2m 47s
run-tests (matrix, base, ubuntu-latest, 3.12, false)	3m 3s
run-tests (tensor, base, ubuntu-latest, 3.9, false)	10m 6s
run-tests (tensor, base, ubuntu-latest, 3.12, false)	11m 20s
run-tests (macos-latest, matrix, base, 3.11, true)	3m 14s
run-tests (macos-latest, tensor, base, 3.11, false)	8m 0s
run-tests (windows-latest, matrix, openblas, 3.11, false, True)	8m 28s
run-tests (windows-latest, tensor, openblas, 3.11, false, True)	18m 2s
run-tests (torch, tensor, ubuntu-latest, 3.11, false)	11m 11s
run-tests (jax, tensor, ubuntu-latest, 3.11, false)	10m 31s
run-tests (tensorflow, tensor, ubuntu-latest, 3.11, false)	14m 1s
run-tests (slepc, matrix, ubuntu-latest, 3.11, false)	3m 6s
	1h 43m 49s

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