lets_expect 0.5.2

Clean tests for Rust
Documentation 
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use lets_expect::{AssertionError, AssertionResult};

fn by_multiplying_by(x: i32) -> impl Fn(&i32, &i32) -> AssertionResult {
    move |before, after| {
        if *after == *before * x {
            Ok(())
        } else {
            Err(AssertionError::new(vec![format!(
                "Expected {} to be multiplied by {} to be {}, but it was {} instead",
                before,
                x,
                before * x,
                after
            )]))
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use lets_expect::lets_expect;

    lets_expect! {
        expect(a *= 5) {
            let mut a = 5;

            to change(a) by_multiplying_by(5)
        }
    }
}