pytest Acceptance tests concerning fixture order should pass

[smarie]

With our new replacement for the fixture closure and parametrization engine (to enable fixture unions in addition to cartesian products), we might have broken the basics. Let's make sure this is not the case.

See https://github.com/pytest-dev/pytest/blob/master/testing/acceptance_test.py#L1096

From pytest-dev/pytest#2405 that was fixed by pytest-dev/pytest#3306

But see also

• function-scoped fixture run before session-scoped fixture pytest-dev/pytest#5303
• ... (?)