Test

✅ Simplify tests setup, one test file for multiple source variants #2500

Job	Run time
test (ubuntu-latest, 3.8, pydantic-v2)	35s
test (ubuntu-latest, 3.8, pydantic-v1)	34s
test (ubuntu-latest, 3.10, pydantic-v2)	57s
test (ubuntu-latest, 3.9, pydantic-v1)	33s
test (ubuntu-latest, 3.9, pydantic-v2)	49s
test (ubuntu-latest, 3.12, pydantic-v1)	44s
test (ubuntu-latest, 3.11, pydantic-v1)	47s
test (ubuntu-latest, 3.11, pydantic-v2)	59s
test (ubuntu-latest, 3.10, pydantic-v1)	35s
test (ubuntu-latest, 3.13, pydantic-v2)	1m 37s
test (ubuntu-latest, 3.12, pydantic-v2)	1m 42s
test (ubuntu-latest, 3.13, pydantic-v1)	39s
coverage-combine	19s
alls-green	4s
	10m 54s

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