In unit test, how to read module event?

[0xaptosj]

Discord user ID

0xaptos

Describe your question in detail.

Take my simple message board contract as an example, I create a message in an object, I emit an event, is there any way to read the event in my unit test? I think current workaround is we create another function like create_message_internal that returns the message object, and call that in unit test. But I hate this approach because it feels so weird.

Ideally we can read the module event in unit test, so i can call the get_message in unit test passing message object to verify contract is correct.

    /// Create a new message
    public entry fun craete_message(sender: &signer, content: String) {
        let message_obj_constructor_ref = &object::create_object(@message_board_addr);
        let message_obj_signer = &object::generate_signer(message_obj_constructor_ref);
        let message = Message {
            creator: signer::address_of(sender),
            creation_timestamp: timestamp::now_seconds(),
            content,
        };
        move_to(message_obj_signer, message);

        event::emit(CreateMessageEvent {
            message_obj: object::object_from_constructor_ref(message_obj_constructor_ref),
            message,
        });
    }

What error, if any, are you getting?

No response

What have you tried or looked at? Or how can we reproduce the error?

No response

Which operating system are you using?

macOS

Which SDK or tool are you using? (if any)

TypeScript SDK

Describe your environment or tooling in detail

No response

[gregnazario]

You can use these test only functions to check emitted events.

https://github.com/aptos-labs/aptos-core/blob/main/aptos-move/framework/aptos-framework/sources/event.move#L21-L28