Trying to mock a struct defined in a separate crate but mock function not called

[saikatdas0790]

Basically my logic resides in structs in different crates that are part of the same Cargo workspace. I've setup a minimal reproduction that tries to mimic my production code. In case the example is unclear, I can clarify further.

What would be the right way to inject the desired behaviour in my unit tests?

Like to reproduction

Basically the behaviour that I want to mock lives here: https://github.com/saikatdas0790/cfg_test_and_not_test/blob/master/contains_lib/src/lib.rs

and the tests run here: https://github.com/saikatdas0790/cfg_test_and_not_test/blob/master/contains_test/src/lib.rs

How do I inject the desired behaviour only in the tests?

[asomers]

Your problem is that the uses_foo method always uses the real Foo, not the MockFoo. Do it like this instead:

mod mocks {
    mock! {
        pub Foo {
            ...
        }
    }
}
#[cfg(test)] 
use mocks::MockFoo as Foo;
#[cfg(not(test))] 
use contains_lib::Foo

[asomers]

Closing, on the assumption that your :heart: means "problem solved".