src/sys/component_manager/src/elf_runner/tests/lifecycle.rs

// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use {
    fuchsia_async as fasync,
    fuchsia_component::client::ScopedInstance,
    fuchsia_syslog::{self as fxlog},
    test_utils_lib::{
        events::{Event, EventMode, EventSource, EventSubscription, Stopped},
        matcher::{EventMatcher, ExitStatusMatcher},
        sequence::EventSequence,
    },
};

#[fasync::run_singlethreaded(test)]
async fn test_normal_behavior() {
    fxlog::init().unwrap();

    let event_source = EventSource::new_sync().unwrap();
    let event_stream = event_source
        .subscribe(vec![EventSubscription::new(vec![Stopped::NAME], EventMode::Sync)])
        .await
        .unwrap();
    event_source.start_component_tree().await;
    let collection_name = String::from("test-collection");
    // What is going on here? A scoped dynamic instance is created and then
    // dropped. When a the instance is dropped it stops the instance.
    let (child_name, destroy_waiter) = {
        let mut instance = ScopedInstance::new(
            collection_name.clone(),
            String::from(
                "fuchsia-pkg://fuchsia.com/elf_runner_lifecycle_test#meta/lifecycle-full.cm",
            ),
        )
        .await
        .unwrap();

        (instance.child_name(), instance.take_destroy_waiter())
    };
    if let Some(e) = destroy_waiter.await {
        panic!("failed to destroy child: {:?}", e);
    }

    let moniker_stem = format!("./{}:{}:", collection_name, child_name);
    let descriptor_moniker = format!("^{}\\d+$", moniker_stem);
    EventSequence::new()
        .then(EventMatcher::ok().moniker(&descriptor_moniker).stop(Some(ExitStatusMatcher::Clean)))
        .expect(event_stream)
        .await
        .unwrap();
}