print!() is failing in execute_query whereas it works out of it

Question

I am doing some rust tests in the elrond blockchain.

When I print a token identifier outside of execute_query, my token is well printed. Whereas, it throws an error when I try to print it in the execute_query.

#[test]
fn test_foo() {
    let mut setup = utils::setup(equip_penguin::contract_obj);

    let token = TokenIdentifier::<DebugApi>::from_esdt_bytes(b"ITEM-a1a1a1");
    // works
    println!("{:x?}", token);

    let b_wrapper = &mut setup.blockchain_wrapper;

    let _ = b_wrapper.execute_query(&setup.cf_wrapper, |sc| {
        // throw errors
        println!("{:x?}", token);
    });
}

The error is

thread 'build_url_with_one_item' panicked at 'called `Option::unwrap()` on a `None` value', /home/username/.cargo/registry/src/github.com-1ecc6299db9ec823/elrond-wasm-debug-0.27.4/src/tx_mock/tx_managed_types.rs:38:31

The utils::setup used in the above snippet code from this doc https://docs.elrond.com/developers/developer-reference/rust-testing-framework/

How does this error happens?

Answer 1

Okay, managed types must be declared inside execute_query.

The above code works:

#[test]
fn test_foo() {
    let mut setup = utils::setup(equip_penguin::contract_obj);

    let b_wrapper = &mut setup.blockchain_wrapper;

    let _ = b_wrapper.execute_query(&setup.cf_wrapper, |sc| {
        let token = TokenIdentifier::<DebugApi>::from_esdt_bytes(b"ITEM-a1a1a1");
        println!("{:x?}", token);
    });
}