When to Apply: Reference when writing .NET tests with NUnit's constraint-based assertion model, using [TestCase] attributes for data-driven tests, or integrating Moq for mocking. Triggers on "NUnit", "[TestFixture]", "[Test]", "Assert.That", "C# unit test".
Playbook Deep Dive (10 sections): §1 Project Setup & Configuration · §2 Test Patterns — Test & TestCase · §3 Constraint Model (Assert.That) · §4 OneTimeSetUp, Fixtures & Parallel Execution · §5 Async Testing · §6 Test Data with Bogus · §7 Categories & Filtering · §8 CI/CD Integration · §9 Debugging Table · §10 Best Practices
The agent loads from 2 on-demand reference files (advanced-patterns.md, playbook.md) containing detailed implementation guides, cloud integration patterns, debugging tables, and language-specific best practices.