How to unit test EF Core applications effectively (In-Memory vs SQLite vs Testcontainers)?

Updated Apr 28, 2026

Short answer

Testing EF Core requires careful selection of the database provider to balance speed with SQL fidelity.

In-Memory Provider: Fast, but lacks relational integrity (no foreign keys, no unique constraints). Often discouraged now. 2. SQLite In-Memory: Better relational support, fast, but SQL dialect differs from SQL Server/Postgres. 3. Testcontainers: Spins up a real Docker container of the target database. Best fidelity, highly recommended for modern integration testing, though slower.

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