Use same struct across multiple test files [duplicate]

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• What is idiomatic way to have shared utility functions for integration tests and benchmarks? 2 answers

I have two test files located in the tests directory. Each test file contains a test function and a common struct. For example, they both contain:

#[macro_use] extern crate serde_derive;

#[derive(Deserialize)]
struct MyStructure {
    a_value: u8,
}

#[test]
// ...some test functions...

The struct MyStructure is exactly the same between the two test files. As my struct uses a macro from the serde_derive crate, the line #[macro_use] extern crate serde_derive is required.

In order to avoid code repetition, I would like to declare my struct only once. From what I understand, every file from the tests directory is compiled as an individual crate, so it seems impossible to edit the test file and put the struct definition into a separate file in the tests directory:

#[macro_use] extern crate serde_derive;

mod structure;

#[test]
// ...some test function...

#[macro_use] extern crate serde_derive;

#[derive(Deserialize)]
struct Structure {
    a_value: u8,
}

This first try leads to error[E0468]: an extern crate loading macros must be at the crate root. This is normal as structure is now a sub-module.

Removing #[macro_use] extern crate serde_derive; from structure doesn't help either, as structure is compiled as an individual crate, and now Deserialize cannot be found: error: cannot find derive macro Deserialize in this scope.

What is the proper way to move MyStructure (including the macro usage) into a separate common file and define it only once for all my test files?