Is there any way to run a single test

[burntsushi]

Is there any way to run a single test

[tomjakubowski]

You can pass a filter to the test runner which is a regex matching test names you'd like to run.

So if you have a src/lib.rs like:

#[quickcheck]
fn double_reversal_is_identity(xs: Vec<int>) -> bool {
    xs == reverse(reverse(xs.as_slice()).as_slice())
}

#[quickcheck]
fn a_failing_test(xs: Vec<int>) -> bool {
    xs == reverse(xs.as_slice())
}

With Cargo, you can run:

$ cargo test -- "double_reversal_is_identity"

so that only the double_reversal_is_identity test is run (arguments after the -- are passed directly to the test runner). If you're building the test runner yourself:

$ rustc --test src/lib.rs && ./lib double_reversal_is_identity

should do the trick. This also works for ordinary #[test] functions.

See cargo test --help which lists options and arguments for the cargo test command, and cargo test -- --help which lists options and arguments for the test runner itself, for more information.

[huonw]

The testing guide has more info too.

[tolgap]

@tomjakubowski @huonw thank you guys, that's more than enough info/documentation 👍