mockmock.rs

#![cfg_attr(test, feature(proc_macro, proc_macro_mod))]
#[cfg(test)] // It's needed only for test runs
extern crate mocktopus;

#[cfg(test)]
mod tests {
    use mocktopus::macros::*; // Lack of that line was crashing your code :)
    use mocktopus::mocking::*;

    // annotating a struct does nothing
    // #[cfg_attr(test, mockable)]
    pub struct Real;
    // annotating an impl block does EVERYTHING, it lets mock functions inside
    // BTW consider annotating `mod tests {`, the macro will find `sayit` inside and will make it mockable
    #[cfg_attr(test, mockable)]
    impl Real {
        pub fn sayit(&self) -> u32 {
            1
        }
    }

    #[test]
    fn it_works() {
        let r = Real{};
        // mock_raw is needed only for special cases, where the closure
        // does not have static lifetime (e.g. uses a reference to a local variable)
        // use mock_safe wherever you can!
        Real::sayit.mock_safe(|_| MockResult::Return(0));

        assert_eq!(r.sayit(), 0);
    }
}