Egil Hansen

Egil Hansen, a Microsoft MVP and creator of BUnit, dives into the world of app testing. He emphasizes the importance of creating valuable, durable tests that withstand changes. Egil discusses the balance between end-to-end and integration tests, and how to keep tests resistant to refactoring. He favors custom fakes over generic mocks for clarity, explores the potential of AI in generating and reviewing tests, and shares insights on mutation testing to uncover missing scenarios. With practical advice, he guides developers toward efficient testing practices.

Egil Hansen, an author and Microsoft MVP, shares his expertise on creating valuable tests for .NET applications. He emphasizes that effective testing is not just for developers but should withstand changes over time. The discussion highlights the four pillars of a valuable test suite and the tradeoffs between integration and unit testing. Egil also dives into using AI for generating and reviewing tests, cautioning against the maintenance burden of AI-generated tests, and he introduces mutation testing to identify weak spots in test coverage.

Egil Hansen, developer and Microsoft MVP who created BUnit, talks testing strategy and tooling. He outlines four pillars of valuable tests. He compares integration vs unit approaches and favors externally observable behavior. He discusses custom fakes over mocks, using interfaces at system edges, mutation testing with Stryker, and how LLMs can write or review tests.