Tests

[ENH] Extend `Extension` class test suite #1931

Job	Run time
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:false)	4s
(windows-latest, Py, sk0.24.*, sk-only:false)	2s
docker	3s
(ubuntu-latest,Py3.10,sk1.4.*,sk-only:true)	48s
(ubuntu-latest,Py3.11,sk1.5.*,sk-only:true)	1m 0s
(ubuntu-latest,Py3.11,sk1.3.*,sk-only:true)	57s
(ubuntu-latest,Py3.10,sk1.3.*,sk-only:true)	57s
(ubuntu-latest,Py3.12,sk1.3.*,sk-only:true)	57s
(ubuntu-latest,Py3.12,sk1.4.*,sk-only:true)	1m 6s
(ubuntu-latest,Py3.11,sk1.7.*,sk-only:true)	57s
(ubuntu-latest,Py3.14,sk1.5.*,sk-only:true)	4m 32s
(ubuntu-latest,Py3.10,sk1.6.*,sk-only:true)	57s
(windows-latest,Py3.12,sk1.5.*,sk-only:false)	1h 16m 3s
(ubuntu-latest,Py3.14,sk1.7.*,sk-only:false)	1h 59m 30s
(ubuntu-latest,Py3.11,sk1.4.*,sk-only:true)	57s
(ubuntu-latest,Py3.10,sk1.7.*,sk-only:true)	1m 12s
(ubuntu-latest,Py3.13,sk1.5.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.13,sk1.7.*,sk-only:true)	58s
(ubuntu-latest,Py3.12,sk1.5.*,sk-only:true)	1m 0s
(ubuntu-latest,Py3.10,sk1.5.*,sk-only:true)	1m 4s
(ubuntu-latest,Py3.11,sk1.6.*,sk-only:true)	1m 4s
(ubuntu-latest,Py3.12,sk1.5.*,sk-only:false)	1h 48m 13s
(ubuntu-latest,Py3.14,sk1.7.*,sk-only:true)	1m 11s
(ubuntu-latest,Py3.13,sk1.6.*,sk-only:true)	58s
(ubuntu-latest,Py3.14,sk1.6.*,sk-only:true)	4m 33s
(ubuntu-latest,Py3.12,sk1.7.*,sk-only:true)	1m 5s
(ubuntu-latest,Py3.12,sk1.5.,pd:2.,sk-only:false)	1h 37m 39s
(ubuntu-latest,Py3.12,sk1.6.*,sk-only:true)	1m 5s
	7h 9m 55s

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