testing

Architecture Tests in .NET: Stop Module Boundary Drift

May 9, 2026 - 5 min read - 1100 words

Code reviews catch typos. They do not catch a controller quietly importing Microsoft.EntityFrameworkCore and bypassing your repository layer. Architecture tests do — at build time, on every PR. Here is a pragmatic playbook for .NET teams.

Don't Mock the Database — Use Testcontainers Instead

Apr 19, 2026 - 5 min read - 900 words

JF Meyers

Framework Author

EF Core InMemory and SQLite lie about PostgreSQL. Use Testcontainers to run ephemeral real databases in your integration tests — zero mocks, zero surprises in prod.

Stop Using DateTime.Now — Inject TimeProvider Instead

Feb 14, 2026 - 2 min read - 400 words

JF Meyers

Framework Author

DateTime.Now makes your code untestable and timezone-fragile. Here is how to replace it with TimeProvider and IClock for deterministic, test-friendly time.