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Cargo Test Prune
Cargo Test Prune is a Rust CLI tool that finds overlapping tests using mutation testing to propose smaller test sets.
Cargo Test Prune is a Rust tool that measures which deliberate bugs each test catches to help developers decide which old tests still add value. It copies the workspace to a temporary directory, runs baseline tests, generates mutations using cargo-mutants, and runs every active test separately to find redundancy. The tool uses a greedy weighted set cover algorithm to propose a smaller test set while retaining mutant detection coverage, reporting evidence for review without deleting tests. It is designed for Rust developers using standard libtest unit and integration tests in self-contained workspaces. It stands out by providing concrete mutation testing evidence and Mermaid flowchart report generation.
Cargo Test Prune at a glance
Key features
- Measures deliberate bugs caught by each test
- Proposes a smaller test set with equal mutant detection
- Saves observations and proposals to a JSON file
- Generates Mermaid flowchart reports for visualization
- Supports weighting by baseline wall time
- Allows pinning tests with the keep option
Use it for
- Identifying redundant Rust tests
- Optimizing test suite execution time
- Reviewing mutant detection coverage
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