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assert_not_called

assert_not_called checks that a subscriber's handler never ran.

It passes when the record of that subscription, subscriber(name), is empty. A name no handler subscribes to has an empty record as well, so a misspelled name passes. A positive check on a neighbour guards against that: here assert_called_once on "orders" shows the order did arrive. The handler sends only an order without an id on to "rejected", so a valid order leaves the review subscription untouched. It returns nothing, so it ends a chain. assert_called(n) expects any number of calls.

Example​

examples/testing_subscriber_calls.rs
#[tokio::test]
async fn a_valid_order_is_not_reviewed() -> Result<(), Box<dyn Error>> {
    let tb = TestApp::start(app()).await?;
    let broker = tb.broker::<MemoryBroker>();
    broker
        .message(&Order { id: 7 })
        .to("orders")
        .publish()
        .await?;

    broker.subscriber("orders").assert_called_once();
    broker.subscriber("rejected").assert_not_called();
    Ok(())
}