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with

with(&value) checks that the latest handler call received this value, decoded with the default codec.

It reads the most recent call only; the earlier ones are in received. It decodes the recorded payload with DefaultCodec, the codec the enabled features select (json first). A handler mounted with another codec is checked with with_codec(&codec, &value), which decodes with that codec. The value type needs Deserialize, PartialEq and Debug. The latest call must hold one delivery: on a batch of several it panics, and the batch is read with batches. with_raw checks the same call as bytes, and with_value the value a carrying delivery lent the handler. A destination's with checks the value a publish carried.

Example​

examples/testing_subscriber_payloads.rs
#[tokio::test]
async fn the_latest_call_got_the_second_order() -> Result<(), Box<dyn Error>> {
    let tb = TestApp::start(app()).await?;
    let broker = tb.broker::<MemoryBroker>();
    for id in [7, 8] {
        broker.message(&Order { id }).to("orders").publish().await?;
    }

    broker
        .subscriber("orders")
        .assert_called(2)
        .with(&Order { id: 8 });
    Ok(())
}