murf 0.2.0

A mocking and unit test framework for rust
Documentation 
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use std::fmt::{Debug, Display, Formatter, Result as FmtResult};

use crate::Matcher;

/// Creates a new [`Inspect`] matcher that prints the argument to stdout and then
/// forwards it to the passed `inner` matcher.
pub fn inspect<M>(inner: M) -> Inspect<M> {
    Inspect(inner)
}

/// implements a [`Matcher`] that prints the argument to stdout and then forwards
/// it to the passed inner matcher `M`.
#[must_use]
#[derive(Debug)]
pub struct Inspect<M>(pub M);

impl<T, M> Matcher<T> for Inspect<M>
where
    T: Debug,
    M: Matcher<T>,
{
    fn matches(&self, value: &T) -> bool {
        println!(
            "{}",
            FormatHelper {
                matcher: &self.0,
                value
            }
        );

        self.0.matches(value)
    }
}

impl<M> Display for Inspect<M>
where
    M: Display,
{
    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
        self.0.fmt(f)
    }
}

struct FormatHelper<'a, M, T> {
    matcher: &'a M,
    value: &'a T,
}

impl<'a, M, T> Display for FormatHelper<'a, M, T>
where
    M: Matcher<T>,
    T: Debug,
{
    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
        write!(f, "Expect ")?;
        self.matcher.fmt(f)?;
        write!(f, " to match {:?}", self.value)?;

        Ok(())
    }
}