asserting 0.14.0

Fluent assertions for tests in Rust that are convenient to write and easy to extend.
Documentation 
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//! Implementation of the predicate assertion.

use crate::expectations::Predicate;
use crate::spec::{DiffFormat, Expectation, Expression, Invertible};
use crate::std::{format, string::String};

impl<S, P> Expectation<S> for Predicate<P>
where
    P: Fn(&S) -> bool,
{
    fn test(&mut self, subject: &S) -> bool {
        (self.predicate)(subject)
    }

    fn message(
        &self,
        expression: &Expression<'_>,
        _actual: &S,
        inverted: bool,
        _format: &DiffFormat,
    ) -> String {
        self.message.clone().unwrap_or_else(|| {
            format!("expected {expression} to satisfy the given predicate, but returned {inverted}")
        })
    }
}

impl<P> Invertible for Predicate<P> {}

#[cfg(test)]
mod tests;