Testing the updated smart contract

In this lesson, you'll learn how to test the SendHelloTo message and confirm its assignment to the correct account in the result log.

We'll utilize the gtest library, initialize the logger, create a Program object and employ the assert function to ensure the program's proper functionality. Lastly, we'll test the SendHelloTo message by utilizing the send function and verifying the anticipated log.

To begin, we'll test the SendHelloTo message. We'll specify the account ID as the message recipient and verify in the result log the assignment of a message to the account.

tests/hello_world_test.rs

use gtest::{Log, Program, System};
use hello_world::InputMessages;

#[test]
fn hello_test() {
    let sys = System::new();
    sys.init_logger();
    let program = Program::current(&sys);
    let res = program.send_bytes(2, String::from("Hello"));
    assert!(!res.main_failed());

    // test `SendHelloTo`
    let hello_recipient: u64 = 4;
    let res = program.send(
        2,
        InputMessages::SendHelloTo(hello_recipient.into()),
    );
    let expected_log = Log::builder()
        .dest(hello_recipient)
        .payload(String::from("Hello"));
    assert!(res.contains(&expected_log))
}