Layered Architecutre and Integration Test

✅ Layered Architecutre in Spring

• ❓ why use layered architecture?
• separation of concerns

• to organize code by responsitbility

• Presentation Layer Controller: handles HTTP request & response
• Business Layer Service : business logic

• Persistence Layer Repository, Data access: access DB

• Controller 👉🏻 Service 👉🏻 Repository 👉🏻 Database

✅ Integration test

• 👎🏻 Unit test is limited to testing a single class in isolation
• In real life, several modules cooperate
• 👉🏻 check how multiple parts of the system interact together

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