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Update CONTRIBUTING.md: Add nextest usage examples

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CONTRIBUTING.md
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@ -1,4 +1,4 @@
<!-- spell-checker:ignore reimplementing toybox RUNTEST -->
<!-- spell-checker:ignore reimplementing toybox RUNTEST CARGOFLAGS nextest -->
# Contributing to coreutils
@ -137,6 +137,14 @@ If you also want to test the core utilities:
cargo test -p uucore -p coreutils
```
Running the complete test suite might take a while. We use [nextest](https://nexte.st/index.html) in
the CI and you might want to try it out locally. It can speed up the execution time of the whole
test run significantly if the cpu has multiple cores.
```shell
cargo nextest run --features unix --no-fail-fast
```
To debug:
```shell
@ -171,6 +179,15 @@ To include tests for unimplemented behavior:
make UTILS='UTILITY_1 UTILITY_2' SPEC=y test
```
To run tests with `nextest` just use the nextest target. Note you'll need to
[install](https://nexte.st/book/installation.html) `nextest` first. The `nextest` target accepts the
same arguments like the default `test` target, so it's possible to pass arguments to `nextest run`
via `CARGOFLAGS`:
```shell
make CARGOFLAGS='--no-fail-fast' UTILS='UTILITY_1 UTILITY_2' nextest
```
### Run Busybox Tests
This testing functionality is only available on *nix operating systems and
@ -326,7 +343,6 @@ if changes are not reflected in the report then run `cargo clean` and run the ab
If you are using stable version of Rust that doesn't enable code coverage instrumentation by default
then add `-Z-Zinstrument-coverage` flag to `RUSTFLAGS` env variable specified above.
## Other implementations
The Coreutils have different implementations, with different levels of completions:
@ -342,7 +358,6 @@ The Coreutils have different implementations, with different levels of completio
However, when reimplementing the tools/options in Rust, don't read their source codes
when they are using reciprocal licenses (ex: GNU GPL, GNU LGPL, etc).
## Licensing
uutils is distributed under the terms of the MIT License; see the `LICENSE` file