Function xpct::map

pub fn map<'a, In, Out>(
    func: impl FnOnce(In) -> Out + 'a
) -> Matcher<'a, In, Out>where
    In: 'a,
    Out: 'a,

Infallibly map the input value by applying a function to it.

This does the same thing as Assertion::map.

This matcher always succeeds, even when negated. Therefore negating it has no effect.

Examples

use std::convert::Infallible;
use xpct::{expect, map, equal};

fn do_stuff() -> Result<String, Infallible> {
    Ok(String::from("foobar"))
}

expect!(do_stuff())
    .to(map(Result::unwrap))
    .to(equal("foobar"));