Import a library struct in tests suite - rust

Question

i'm trying to acces a struct from the lib i'm creating to perform some unit tests.
here is a sample of the code:
src/token_deserializer.rs
use serde::Deserialize;
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Token {
pub payment_data: PaymentData,
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct PaymentData {
pub data: String,
pub signature: String,
pub header: String,
pub version: String,
}
src/lib.rs
use serde_json::from_str;
use token_deserializer::Token;
pub mod token_deserializer;
pub fn deserialize_token(token: &str) -> Token{
let object: Token = from_str(token).expect("JSON was not well-formatted");
return object;
}
tests/mytest.rs
#[cfg(test)]
mod tests {
use std::fs::File;
use apple_pay_token_decryptor::deserialize_token;
use apple_pay_token_decryptor::Token;
#[test]
fn test_token_deserialization(){
let mut file = File::open("text.json").unwrap();
let mut data = String::new();
let object: Token = deserialize_token(&data);
}
}
Here i can't manage to import Token for my test => error[E0603]: struct `Token` is private
Do i need to import it in lib.rs or something else ?

Answer 1

Inside your test, you refer to apple_pay_token_decryptor::Token. You may think it is resolved to the pub struct Token, but in fact, it is not. Instead, it refers to this use in src/lib.rs:
use token_deserializer::Token;
And while both the struct and the token_deserializer module are public - this import is private (it is not pub use, i.e. a reexport). But it's still there. And thus the compiler complains about you using a private type.
To fix, that you either have to reexport Token - i.e. make that pub use token_deserializer::Token;, or fix the test to import the struct directly from token_deserializer:
use apple_pay_token_decryptor::token_deserializer::Token;