Controlling cargo-mutants

cargo mutants takes various options to control how it runs.

These options, can, in general, be passed on the command line, set in a .cargo/mutants.toml file in the source tree, or passed in CARGO_MUTANTS_ environment variables. Not every method of setting an option is available for every option, however, as some would not make sense or be useful.

Execution order

By default, mutants are run in a randomized order, so as to surface results from different parts of the codebase earlier. This can be disabled with --no-shuffle, in which case mutants will run in order by file name and within each file in the order they appear in the source.

Source directory location

-d, --dir: Test the Rust tree in the given directory, rather than the source tree enclosing the working directory where cargo-mutants is launched.

--manifest-path: Also selects the tree to test, but takes a path to a Cargo.toml file rather than a directory. (This is less convenient but compatible with other Cargo commands.)