Test Events

Tests can assert on events that are expected to be published.

The following example sets up a test environment, registers an increment contract, and checks after the increment invocations which events were published.

#[test]
fn test() {
    let env = Env::default();
    let contract_id = env.register(IncrementContract, ());
    let client = IncrementContractClient::new(&env, &contract_id);

    assert_eq!(client.increment(), 1);
    assert_eq!(client.increment(), 2);
    assert_eq!(client.increment(), 3);

    assert_eq!(
        // Get all events published since the Env was created.
        env.events().all(),
        // Compare the events with the expected events.
        vec![
            &env,
            (
                contract_id.clone(),
                (symbol_short!("COUNTER"), symbol_short!("increment")).into_val(&env),
                1u32.into_val(&env)
            ),
            (
                contract_id.clone(),
                (symbol_short!("COUNTER"), symbol_short!("increment")).into_val(&env),
                2u32.into_val(&env)
            ),
            (
                contract_id,
                (symbol_short!("COUNTER"), symbol_short!("increment")).into_val(&env),
                3u32.into_val(&env)
            ),
        ]
    );
}

tip

For the full example the above snippet is extracted from, see the events example contract.