How to set up Stryker.NET in a .NET Core project?

Install it globally using 'dotnet tool install -g dotnet-stryker', navigate to your unit test project folder, and run 'dotnet stryker'. Refer to the getting started guide for detailed steps and configuration options.

Stryker.NET vs code coverage tools like Coverlet – which is better?

Stryker.NET measures test effectiveness by simulating bugs, while code coverage only shows which code is executed. Use Stryker for rigorous quality assurance, but combine with coverage for a holistic view, as each serves different purposes.

Does Stryker.NET work with xUnit or NUnit test frameworks?

Yes, Stryker.NET is compatible with common .NET test frameworks like xUnit, NUnit, and MSTest. It runs your existing test suite to detect mutations, so ensure your tests are properly configured in the project.

How can I speed up Stryker.NET runs for large codebases?

Use configuration options to limit mutation types, exclude certain files, or run in parallel. However, mutation testing is inherently slow, so consider running it only in CI/CD or for critical code sections.

What does a high mutation score mean in Stryker.NET reports?

A high mutation score indicates that most simulated bugs were detected by your tests, suggesting a robust test suite. A low score highlights gaps where tests might miss real defects, guiding improvements.

Can I integrate Stryker.NET with Azure DevOps or GitHub Actions?

Yes, Stryker.NET can be integrated into CI/CD pipelines using command-line execution. Generate reports like HTML or JSON for visualization, and use badges to display mutation scores in dashboards.

Open-Awesome

Stryker.NET

Apache-2.0C#dotnet-stryker@4.14.2

Mutation testing tool for .NET Core and .NET Framework projects that tests your tests by inserting temporary bugs.

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What is Stryker.NET?

Stryker.NET is a mutation testing tool for .NET Core and .NET Framework projects that helps developers assess the quality of their test suites. It works by temporarily inserting bugs (mutations) into source code and checking whether existing tests can detect these changes, providing a more accurate measure of test effectiveness than traditional code coverage metrics.

Target Audience

.NET developers and teams who want to improve their test suite quality and ensure their tests actually catch bugs, particularly those working on mission-critical applications or libraries.

Value Proposition

Stryker.NET provides the most rigorous approach to testing test quality through mutation testing, giving developers confidence that their tests will catch real bugs. Unlike simple code coverage tools, it actually validates whether tests would detect code changes that introduce defects.

Overview

Mutation testing for .NET core and .NET framework!

Use Cases

Best For

Measuring the actual effectiveness of unit test suites beyond code coverage
Identifying weak spots in test coverage where bugs could slip through
Improving test quality for .NET libraries and frameworks
Validating test suites for mission-critical .NET applications
Comparing test quality across different .NET projects or teams
Educational purposes to demonstrate mutation testing concepts in .NET

Not Ideal For

Projects with strict CI/CD time limits where mutation testing's slow execution would bottleneck deployments
Teams that primarily rely on manual testing or lack a comprehensive unit test suite to assess
Legacy .NET applications with minimal automated tests, as the low initial mutation score may not justify setup effort
Environments where computational resources are heavily constrained, as mutation testing is CPU and memory intensive

Pros & Cons

Pros

Rigorous Test Assessment

Uses mutation testing to simulate real bugs by inserting changes into source code, providing a scientific measure of test effectiveness beyond code coverage, as highlighted in the project's philosophy.

Comprehensive Mutation Types

Supports various mutation operators like arithmetic and logical changes, detailed in the mutations documentation linked from the README, ensuring thorough bug simulation.

Detailed HTML Reporting

Generates visual dashboards and flexible reports to help analyze mutation results, mentioned under key features for better test quality insights.

Cross-Platform .NET Support

Works with both .NET Core and .NET Framework projects, tested up to .NET Core 3.1 and .NET Framework 4.8, as stated in the compatibility section.

Cons

High Performance Overhead

Mutation testing requires running the test suite multiple times for each mutant, leading to slow execution times that can impede rapid feedback in development cycles.

Complex Setup and Configuration

Involves installing as a global tool, running in specific project folders, and tuning extensive configuration options, which can be daunting for new users despite documentation.

External Documentation Dependency

Critical documentation like configuration and mutations is hosted externally on stryker-mutator.io, making offline access difficult and potentially fragmenting the user experience.

Frequently Asked Questions

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