refactor: remove some duplications in tests (#1783)

* Removes test duplications.

* Adds t.Helper().

* Fixes tests.

* UUpdate frankenphp_test.go

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

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Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

Author: AlliBalliBaba