Mocking framework for Rust (currently only nightly). See [documentation](https://docs.rs/mocktopus/) for more.
```rust
#[mockable]
mod hello_world {
pub fn world() -> &'static str {
"world"
}
pub fn hello_world() -> String {
format!("Hello {}!", world())
}
}
#[test]
fn mock_test() {
hello_world::world.mock_safe(|| MockResult::Return("mocking"));
assert_eq!("Hello mocking!", hello_world::hello_world());
}
```