How do you test EF Core features (unit tests / integration tests)?

Short answer: Unit Tests: Focus on logic without actual database. Use mocks or in-memory databases to isolate tests. Integration Tests: Use real database (or test instance) to validate EF Core behavior, migrations, and data persistence. Tests cover CRUD operations, queries, and business logic using EF Core.

Real-world example (ShopNest)

ShopNest’s order service uses EF Core to save an Order and its line items in one SaveChangesAsync() call inside a transaction.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.