[Testing] Unit tests para handlers y servicios

[victorZKov]

Descripción

Implementar unit tests para asegurar calidad del código.

Áreas a cubrir

Application Layer (Handlers)

• Pipeline handlers (Create, Update, Delete, Toggle, Scan)
• Configuration handlers (Timer, Connections, Recipients, AI)
• Drift handlers (Query, Export)
• Scan handlers (Query, Stats)
• Credential handlers (Query, Test, Rotate)
• Analysis handlers (Trigger)

Infrastructure Layer (Services)

• KeyVaultService
• MessageQueueService
• SignalRService
• EmailService
• AdoService
• AzureResourceService

Infrastructure Layer (Repositories)

• PipelineRepository
• DriftRecordRepository
• ScanLogRepository
• ConfigurationRepository
• CredentialRepository

Herramientas

• xUnit para tests
• Moq para mocking
• FluentAssertions para assertions

Archivos a crear

• tests/Chivato.Application.Tests/
• tests/Chivato.Infrastructure.Tests/

Criterios de aceptación

• >80% code coverage en handlers
• Tests pasan en CI pipeline
• Mocks para dependencias externas