K9 - Rust Testing Library

Rust testing library that provides a set of assertions that are similar to built in assert and assert_eq but provide more context about the failure and use ANSI terminal colors to format the error messages.

It also includes assert_matches_snapshot! macro. When first run with K9_UPDATE_SNAPSHOTS=1 it will save the contents of the passed argument into a __k9_snapshots__/my_test_file/my_test.snap file, and for every next run it will compare the passed value with the existing snapshot and fail if the values are different.

use k9::{assert_equal, assert_matches_regex, assert_err_matches_regex, assert_matches_snapshot};

assert_equal!(1, 1);
assert_equal!("one", "one");


#[derive(Debug, PartialEq)]
struct A {
    name: &'static str,
    age: u32,
}

let a1 = A { name: "Bob", age: 44 };
let a2 = A { name: "Alice", age: 22 + 22 };

assert_equal!(&a1, &a2);


assert_matches_regex!(a2.name, "Al\\w{3}");

assert_matches_snapshot!(format!("{:#?}", a1));

let result: Result<(), &str> = Err("http request fail. code 123");
assert_err_matches_regex!(result, "code 123");