Function multi_location_test 

pub async fn multi_location_test<'a, T, C, O: Ordering, R: Retries>(
    thunk: impl FnOnce(&FlowBuilder<'a>, &Process<'a, ()>) -> Stream<T, Process<'a>, Unbounded, O, R>,
    check: impl FnOnce(Pin<Box<dyn Stream<Item = T>>>) -> C,
)
where
    T: Serialize + DeserializeOwned + 'static,
    C: Future<Output = ()>,

Available on crate feature deploy only.

Sets up a test with multiple processes / clusters declared in the test logic (thunk). The test logic must return a single streaming output, which can then be read in check (an async closure) to perform assertions.

Each declared process is deployed as a single local process, and each cluster is deployed as four local processes.