fix(tests,#18896): guard_test_root -- bloc pytest sans xdist matche + erreur explicite si bloc absent - #18951

fix(tests,#18896): guard_test_root -- bloc pytest sans xdist matche + erreur explicite si bloc absent#18951

myia-ai-01 merged 5 commits into

feature/18888-test-collection-fixjsboige/CoursIA:feature/18888-test-collection-fixfrom

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