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Property-Based and Mutation Testing

Property-based testing and mutation testing are two advanced testing strategies that complement traditional unit testing by exploring edge cases and measuring test suite effectiveness. Property-based testing uses FsCheck to automatically generate thousands of test cases against defined properties, catching bugs in unexpected input combinations. Mutation testing with Stryker.NET deliberately introduces defects into your code and checks whether your tests detect them, revealing gaps in test coverage.

This series bridges the gap from traditional example-based testing to modern property-based approaches and quality metrics. Over ten tutorials, you'll learn FsCheck fundamentals and custom generators, apply mutation testing to measure test effectiveness, and discover how these techniques work together to build more robust test suites. Each article combines theory with practical C# examples you can apply immediately.

Articles in this series​

  1. What Is Property-Based Testing in C#?
  2. How to Install and Configure FsCheck
  3. Writing Your First Property Test with FsCheck
  4. Custom Generators and Shrinking in FsCheck
  5. Testing Stateful Systems with Properties
  6. What Is Mutation Testing and Why It Matters
  7. Getting Started with Stryker.NET
  8. Understanding Mutation Operators and Analysis
  9. Improving Test Quality with Mutation Testing
  10. Combining Property-Based and Mutation Testing Strategies