test: AdminPolicyTest – behörighetsregler

[lindaeskilsson]

Följ samma mönster som CommentPolicyTest och PetPolicyTest.
Täcker alla metoder i AdminPolicy för rollerna ADMIN, OWNER och VET, inklusive edge cases som null-värden och åtkomst till andras resurser.

[coderabbitai]

🔗 Related PRs

#163 - test: add unit tests for PetPolicy [closed]
#164 - test: add unit tests for PetService [closed]

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