cargo-mutants-1.2.2

• Don't mutate unsafe fns.

• Don't mutate functions that never return (i.e. -> !).

• Minimum supported Rust version increased to 1.64 due to changes in dependencies.

• Some command-line options can now also be configured through environment variables: CARGO_MUTANTS_JOBS, CARGO_MUTANTS_TRACE_LEVEL.

• New command line option --minimum-test-timeout and config file variable minimum_test_timeout join existing environment variable CARGO_MUTANTS_MINIMUM_TEST_TIMEOUT, to allow boosting the minimum, especially for test environments with poor or uneven throughput.

• Changed: Renamed fields in outcomes.json from cargo_result to process_status and from command to argv.

• Warn if no mutants were generated or if all mutants were unviable.

cargo-mutants-1.2.1

• Converted most of the docs to a book available at https://mutants.rs/.

• Fixed: Correctly find submodules that don't use mod.rs naming, e.g. when descending from src/foo.rs to src/foo/bar.rs. Also handle module names that are raw identifiers using r#. (Thanks to @kpreid for the report.)

cargo-mutants 1.2.0

Thankful mutants!

• Fixed: Files that are excluded by filters are also excluded from --list-files.

• Fixed: --exclude-re and --re can match against the return type as shown in --list.

• New: A .cargo/mutants.toml file can be used to configure standard filters and cargo args for a project.

cargo-mutants 1.1.1

Spooky mutants!

• Fixed support for the Mold linker, or for other options passed via RUSTFLAGS or CARGO_ENCODED_RUSTFLAGS. (See the instructions in README.md).

• Source trees are walked by following mod statements rather than globbing the directory. This is more correct if there are files that are not referenced by mod statements. Once attributes on modules are stable in Rust (rust-lang/rust#54727) this opens a path to skip mods using attributes.

cargo-mutants-1.1.0

Fearless concurrency!

• cargo-mutants can now run multiple cargo build and test tasks in parallel, to make better use of machine resources and find mutants faster, controlled by --jobs.

• The minimum Rust version to build cargo-mutants is now 1.63.0. It can still be used to test code under older toolchains.

cargo-mutants-1.0.3

• cargo-mutants is now finds no uncaught mutants in itself! Various tests were added and improved, particularly around handling timeouts.

• New: --re and --exclude-re options to filter by mutant name, including the path. The regexps match against the strings printed by --list.

cargo-mutants-1.0.2

• New: cargo mutants --completions to generate shell completions using clap_complete.

• Changed: carg-mutants no longer builds in the source directory, and no longer copies the target/ directory to the scratch directory. Since cargo-mutants now sets RUSTFLAGS to avoid false failures from warnings, it is unlikely to match the existing build products in the source directory target/, and in fact building there is just likely to cause rebuilds in the source. The behavior now is as if --no-copy-target was always passed. That option is still accepted, but it has no effect.

• Changed: cargo-mutants finds all possible mutations before doing the baseline test, so that you can see earlier how many there will be.

• New: Set INSTA_UPDATE=no so that tests that use the Insta library don't write updates back into the source directory, and so don't falsely pass.

cargo-mutants 1.0.1

• Fixed: Don't try to mutate functions within test targets, e.g. within tests/**/*.rs.

• New: missed.txt, caught.txt, timeout.txt and unviable.txt files are written in to the output directory to make results easier to review later.

• New: --output creates the specified directory if it does not exist.

• Internal: Switched from Argh to Clap for command-line parsing. There may be some small changes in CLI behavior and help formatting.

cargo-mutants 1.0.0

A 1.0 release to celebrate that with the addition of workspace handling, cargo-mutants gives useful results on many Rust projects.

• New: Supports workspaces containing multiple packages. Mutants are generated for all relevant targets in all packages, and mutants are subject to the tests of their own package. cargo mutants --list-files --json and cargo mutants --list --json now includes package names for each file or mutant.

• Improved: Generate mutations in cdylib, rlib, and ever other *lib target. For example, this correctly exercises Wasm projects.

• Improved: Write mutants.out/outcomes.json after the source-tree build and baseline tests so that it can be observed earlier on.

• Improved: mutants.out/outcomes.json includes the commands run.

cargo-mutants 0.2.11

• New --exclude command line option to exclude source files from mutants generation, matching a glob.

• New: CARGO_MUTANTS_MINIMUM_TEST_TIMEOUT sets a minimum timeout for cargo tests, in seconds. This can be used to allow more time on slow CI builders. If unset the default is still 20s.

• Added: A new mutants.out/debug.log with internal debugging information.

• Improved: The time for check, build, and test is now shown separately in progress bars and output, to give a better indication of which is taking more time in the tree under test. Also, times are show in seconds with one decimal place, and they are styled more consistently.

• Improved: More consistent use of 'unviable' and other terms for outcomes in the UI.