mutagen
A mutation testing framework for Rust that evaluates test suite quality by injecting and activating code mutations.
What is mutagen?
Mutagen is a mutation testing framework for Rust that evaluates the effectiveness of a test suite by injecting artificial bugs (mutations) into the source code. It helps developers identify weaknesses in their tests by checking if the test suite can detect these changes, going beyond simple code coverage metrics. The framework uses procedural macros to embed mutations at compile time and activates them at runtime via an environment variable.
Rust developers who want to rigorously assess and improve the quality of their test suites, particularly those working on projects where test reliability is critical, such as libraries, safety-critical systems, or applications with complex logic.
Developers choose Mutagen over alternatives because it avoids recompilation by baking all mutations into the code upfront and activating them at runtime, significantly speeding up the mutation testing process. Its coverage-optimized execution mode further reduces time by running only tests affected by each mutation, making it practical for large test suites.
Overview
Breaking your Rust code for fun and profit
Use Cases
Best For
- Evaluating the effectiveness of Rust test suites beyond code coverage metrics
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