test: VetControllerTest

[lindaeskilsson]

testar POST /api/vets, GET /api/vets och GET /api/vets/{id} med MockMvc.
Notera att POST kräver ADMIN via AdminPolicy.

[coderabbitai]

🔗 Related PRs

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

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[lindaeskilsson]

Använd @WebMvcTest(VetController.class) + @import(SecurityConfig.class) och mocka VetService och AdminPolicy.
POST /api/vets:

• ADMIN → 201 Created med VetResponse
• Icke-admin → AdminPolicy kastar ForbiddenException → 403
• Ogiltig request → 400 Bad Request
• licenseId redan tagen → BusinessRuleException → lämplig felkod

GET /api/vets:

• Returnerar lista → 200 OK

GET /api/vets/{id}:

• Hittar vet → 200 OK
• Finns inte → ResourceNotFoundException → 404