Rust Criterion running a unit test as a benchmark

Hi I am trying to use criterion to benchmask some code and have followed the rust book by

having the following structure.

mylibrary
             -> benches
                     -> mybenches.rs
             -> src
                     -> lib.rs
                     -> tests.rs

How can I import a unit test to benchmark by passing it to

c.bench_function("mytest", |b| b.iter(|| tests::my_test()));

Without making tests module public ?
I guessing the issue is can I make the benchmarks in criterion part of the crate.
In the example it show import their test like

use mycrate::fibonacci;

so it not part of the same crate.

Thanks

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