Using .with(...) with string predicates

[TheIndifferent]

Hey everyone!

Could someone please share an example how to use string predicates correctly? No matter what I try nothing works, have to resort to using function predicates. Check out the example code:

trait SomeTrait {
    fn some_function(&self, path: String) -> Result<String, String>;
}

#[cfg(test)]
mod test {
    use mockall::{mock, predicate};

    use crate::mockall_check::SomeTrait;

    mock! {
        SomeTraitMock {}

        impl SomeTrait for SomeTraitMock {
            fn some_function(&self, path: String) -> Result<String, String>;
        }
    }

    #[test]
    fn test_something() {
        let mut mock = MockSomeTraitMock::new();
        mock.expect_some_function()
            //.with(predicate::str::ends_with("/tail"))
            // ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Predicate<std::string::String>` is not implemented for `predicates::str::basics::EndsWithPredicate`
            //.with(predicate::str::ends_with("/tail".to_string()))
            // ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Predicate<std::string::String>` is not implemented for `predicates::str::basics::EndsWithPredicate`
            //.with(predicate::str::ends_with(&"/tail".to_string()))
            // ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Predicate<std::string::String>` is not implemented for `predicates::str::basics::EndsWithPredicate`
            .with(predicate::function(|s: &String|s.ends_with("/tail"))) // WORKS!
            .times(1)
            .return_const(Ok("response".to_string()));

        assert_eq!(
            mock.some_function("/very/long/path/with/tail".to_string()),
            Ok("response".to_string())
        )
    }
}

Thank you!

[asomers]

The problem is that all of those predicates expect a &str argument, but you're actually passing a &String. Maybe you can compose some sort of compound predicate that converts the latter into the former.

[TheIndifferent]

I see, thank you!