Macro assert_validation_err 

macro_rules! assert_validation_err {
    ($validation:expr) => { ... };
}

Assert that a Validation has failures and extract the errors.

Example

use debtmap::testkit::assert_validation_err;
use stillwater::Validation;

let validation: Validation<i32, Vec<String>> = Validation::Failure(vec!["error".to_string()]);
let errors = assert_validation_err!(validation);
assert_eq!(errors.len(), 1);