Mutation testing is gaining traction in Rust, particularly with the active development of the cargo-mutants tool. This article discusses the setup and usage of cargo-mutants, highlighting a personal project where the author ported Java code to Rust. The testing revealed 4 mutants, yet all were caught, sparking curiosity about boundary conditions. A deeper dive into the source code of cargo-mutants uncovered that it attempts to replace logical and relational operators, which could result in missing certain conditions, such as equality checking at boundary values. This insight points to the ongoing challenges in ensuring thorough testing with mutation tools in Rust.
Using cargo-mutants for mutation testing in Rust is straightforward. Install it with 'cargo install --locked cargo-mutants,' then run 'cargo mutants'.
During testing, I found that cargo-mutants identified 4 mutants, but none survived. Unexpectedly, boundary testing for the limit was not detected.
The investigation revealed that cargo-mutants replaces logical and relational operators, which may sometimes lead to failure in detecting all boundary cases.
The crates for mutation testing in Rust show a split: mutagen is stale, while cargo-mutants is actively developed, indicating the evolution of testing tools in the language.
Collection
[
|
...
]