sausage/cli/tests/cargo.rs

//! Native build and WASI libtest integration checks under PROTOCOL.md section 11.
use sausage::{Host, world::World};
use serde_json::{Value, json};
use std::path::{Path, PathBuf};
use tokio::sync::OnceCell;
const CACHE: &str = concat!(env!("CARGO_TARGET_TMPDIR"), "/cache");
struct TestWorld(PathBuf);
impl TestWorld {
    /// Creates a fresh native build world.
    fn new() -> Self {
        let path = std::env::temp_dir().join(format!("sausage-cargo-{}", uuid::Uuid::now_v7()));
        World::create(&path).unwrap();
        Self(path)
    }
    /// Copies a fixture into its plugin source folder.
    fn source(&self, name: &str, source: &Path) {
        copy(source, &self.0.join(format!("plugins/{name}/source")));
    }
}
impl Drop for TestWorld {
    fn drop(&mut self) {
        let _ = std::fs::remove_dir_all(&self.0);
    }
}
/// Copies fixtures without their build outputs or git metadata.
fn copy(source: &Path, destination: &Path) {
    std::fs::create_dir_all(destination).unwrap();
    for entry in std::fs::read_dir(source).unwrap() {
        let entry = entry.unwrap();
        if matches!(entry.file_name().to_str(), Some("target" | ".git")) {
            continue;
        }
        let destination = destination.join(entry.file_name());
        if entry.file_type().unwrap().is_dir() {
            copy(&entry.path(), &destination);
        } else {
            std::fs::copy(entry.path(), destination).unwrap();
        }
    }
}
/// Finds a checked-in build fixture.
fn fixture(name: &str) -> PathBuf {
    Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("tests/crates")
        .join(name)
}
/// Builds through the real registered native plugin.
async fn build(world: &TestWorld, name: &str) -> Result<Value, Value> {
    let host = Host::start_with_cache(&world.0, Path::new(CACHE))
        .await
        .unwrap();
    let runner = world.0.join("state/runner with spaces");
    std::os::unix::fs::symlink(env!("CARGO_BIN_EXE_sausage"), &runner).unwrap();
    sausage::cargo::Cargo::with_runner(World::open(&world.0).unwrap(), runner, Path::new(CACHE))
        .unwrap()
        .register(&host);
    let result = host.call("cargo.build", json!({"plugin":name})).await;
    host.stop().await;
    result
}
struct Valid {
    world: TestWorld,
    result: Value,
    test: PathBuf,
}
/// Shares one successful SDK build while runner invocations retain isolated worlds.
async fn valid() -> &'static Valid {
    static VALID: OnceCell<Valid> = OnceCell::const_new();
    VALID
        .get_or_init(|| async {
            let world = TestWorld::new();
            world.source("valid", &fixture("cargo-valid"));
            std::fs::create_dir_all(world.0.join("plugins/valid/source/target")).unwrap();
            std::fs::write(
                world.0.join("plugins/valid/source/target/excluded"),
                "exclude",
            )
            .unwrap();
            let nested = world.0.join("plugins/valid/source/src/target");
            std::fs::create_dir_all(&nested).unwrap();
            std::fs::write(nested.join("data"), "nested target").unwrap();
            let git = world.0.join("plugins/valid/source/src/.git");
            std::fs::create_dir_all(&git).unwrap();
            std::fs::write(git.join("data"), "nested git").unwrap();
            for number in 1..=20 {
                std::fs::create_dir_all(world.0.join(format!("state/cargo/builds/{number}")))
                    .unwrap();
            }
            std::fs::create_dir_all(world.0.join("state/cargo/tmp/stale")).unwrap();
            std::fs::write(world.0.join("state/cargo/tmp/stale/file"), "stale").unwrap();
            let result = build(&world, "valid")
                .await
                .unwrap_or_else(|error| panic!("build failed: {error}"));
            // Integration tests also build a normal binary. Cargo identifies the libtest artifact.
            let artifacts = tokio::process::Command::new("cargo")
                .args([
                    "test",
                    "--no-run",
                    "--release",
                    "--message-format=json",
                    "--bin",
                    "cargo-valid",
                    "--target",
                    "wasm32-wasip2",
                    "--target-dir",
                ])
                .arg(Path::new(CACHE).join("cargo-target"))
                .current_dir(world.0.join("state/cargo/work"))
                .stdin(std::process::Stdio::null())
                .output()
                .await
                .unwrap();
            assert!(
                artifacts.status.success(),
                "{}",
                String::from_utf8_lossy(&artifacts.stderr)
            );
            let mut tests: Vec<PathBuf> = String::from_utf8_lossy(&artifacts.stdout)
                .lines()
                .filter_map(|line| serde_json::from_str::<Value>(line).ok())
                .filter(|message| {
                    message["reason"] == "compiler-artifact"
                        && message["profile"]["test"] == true
                        && message["target"]["kind"]
                            .as_array()
                            .is_some_and(|kinds| kinds.iter().any(|kind| kind == "bin"))
                })
                .filter_map(|message| message["executable"].as_str().map(PathBuf::from))
                .collect();
            assert_eq!(
                tests.len(),
                1,
                "expected exactly one libtest binary: {tests:?}"
            );
            let test = tests.pop().unwrap();
            Valid {
                world,
                result,
                test,
            }
        })
        .await
}
/// Invokes the same runner subcommand that cargo uses.
async fn runner(valid: &Valid, args: &[&str]) -> std::process::Output {
    let mut command = tokio::process::Command::new(env!("CARGO_BIN_EXE_sausage"));
    command
        .arg("test-runner")
        .arg(&valid.test)
        .args(args)
        .current_dir(valid.world.0.join("state/cargo/work"))
        .kill_on_drop(true);
    tokio::time::timeout(std::time::Duration::from_secs(120), command.output())
        .await
        .expect("test runner exceeded 120 seconds")
        .unwrap()
}

/// T23: unlocks stay ordered before the next lock over 300 acquisitions.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn unlock_order() {
    assert!(
        runner(valid().await, &["unlock_order"])
            .await
            .status
            .success()
    );
}
/// T23: each runner world is empty and has independent proc, self, and run mounts.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn empty_and_isolated_worlds() {
    for name in ["empty_world", "isolation_", "environment", "late_response"] {
        let output = runner(valid().await, &[name]).await;
        assert!(
            output.status.success(),
            "{name}: {} {}",
            String::from_utf8_lossy(&output.stdout),
            String::from_utf8_lossy(&output.stderr)
        );
    }
}
/// T23: successful builds preserve warnings and integration output without cargo progress noise.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn build_output_and_warnings() {
    let valid = valid().await;
    assert!(
        valid.result["warnings"]
            .as_str()
            .unwrap()
            .contains("fixture build warning")
    );
    let output = valid.result["tests"]["output"].as_str().unwrap();
    assert!(output.contains("INTEGRATION_CASE"));
    assert!(!output.contains("Compiling "));
    assert!(!output.contains("  running 1 test"));
    assert!(
        !output
            .lines()
            .any(|line| line.starts_with("  ") && line.trim().is_empty())
    );
}
/// T23: publication retains ten builds and the next build removes abandoned test worlds.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn build_retention_and_temporary_cleanup() {
    let valid = valid().await;
    assert_eq!(
        std::fs::read_dir(valid.world.0.join("state/cargo/builds"))
            .unwrap()
            .count(),
        10
    );
    assert!(!valid.world.0.join("state/cargo/tmp/stale").exists());
    assert_eq!(
        std::fs::read_dir(valid.world.0.join("state/cargo/tmp"))
            .unwrap()
            .count(),
        0
    );
}
/// T23: manifest preparation preserves workspaces, renamed target dependencies, and optional flags.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn manifest_and_nested_sources() {
    let valid = valid().await;
    let root = valid.world.0.join("state/cargo/work");
    let manifest = std::fs::read_to_string(root.join("Cargo.toml")).unwrap();
    assert!(manifest.contains("workspace.package"));
    assert!(manifest.contains("optional = true"));
    let document: toml_edit::DocumentMut = manifest.parse().unwrap();
    let sdk = Path::new(document["target"]["cfg(target_arch = \"wasm32\")"]["dependencies"]["sausage_plugin"]["path"].as_str().unwrap());
    assert_eq!(sdk.parent().unwrap(), Path::new(CACHE).join("sdk"));
    let hash = sdk.file_name().unwrap().to_str().unwrap();
    assert_eq!(hash.len(), 64);
    assert!(hash.bytes().all(|byte| byte.is_ascii_hexdigit()));
    assert_eq!(
        std::fs::read(sdk.join("src/lib.rs")).unwrap(),
        std::fs::read(valid.world.0.join("plugins/cargo/sdk/src/lib.rs")).unwrap()
    );
    assert_eq!(
        std::fs::read_to_string(root.join("src/target/data")).unwrap(),
        "nested target"
    );
    assert_eq!(
        std::fs::read_to_string(root.join("src/.git/data")).unwrap(),
        "nested git"
    );
}
/// T23: discovery describes the native build method and preparation errors name their paths.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn native_discovery_and_error_paths() {
    let world = TestWorld::new();
    let host = Host::start_with_cache(&world.0, Path::new(CACHE))
        .await
        .unwrap();
    assert_eq!(
        host.call("cargo.rpc.discover", json!({})).await.unwrap()["methods"][0]["name"],
        "build"
    );
    let error = host
        .call("cargo.build", json!({"plugin":"missing"}))
        .await
        .unwrap_err();
    assert_eq!(error["code"], -32004);
    assert!(
        error["data"]["output"]
            .as_str()
            .unwrap()
            .contains("plugins/missing/source")
    );
    host.stop().await;
}
/// Rework 3: an unavailable cache prevents builds, not host startup or SDK installation.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn cache_failure_is_deferred_until_build() {
    let world = TestWorld::new();
    world.source("simple", &fixture("cargo-test-fail"));
    // A file blocks directory creation even when the test runs as root.
    let cache = world.0.join("blocked-cache");
    std::fs::write(&cache, "not a directory").unwrap();
    let host = Host::start_with_cache(&world.0, &cache).await.unwrap();
    assert!(world.0.join("plugins/cargo/sdk/src/lib.rs").is_file());
    let error = host
        .call("cargo.build", json!({"plugin":"simple"}))
        .await
        .unwrap_err();
    assert_eq!(error["code"], -32004);
    let output = error["data"]["output"].as_str().unwrap();
    assert!(output.contains(cache.to_str().unwrap()), "{output}");
    assert!(output.contains("create"), "{output}");
    host.stop().await;

    let standalone = TestWorld::new();
    standalone.source("simple", &fixture("cargo-test-fail"));
    let builder = sausage::cargo::Cargo::with_runner(
        World::open(&standalone.0).unwrap(),
        PathBuf::from(env!("CARGO_BIN_EXE_sausage")),
        &cache,
    )
    .unwrap();
    assert!(standalone.0.join("plugins/cargo/sdk/src/lib.rs").is_file());
    let error = builder
        .build(&standalone.0.join("plugins/simple/source"))
        .await
        .unwrap_err();
    assert!(error.output.contains(cache.to_str().unwrap()), "{error}");
    assert!(cache.is_file());
}
/// T23: release-only failures use data.output and retain successful WASI totals.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn release_only_failure() {
    let world = TestWorld::new();
    let root = world.0.join("plugins/release/source/src");
    std::fs::create_dir_all(&root).unwrap();
    std::fs::write(
        root.parent().unwrap().join("Cargo.toml"),
        "[package]\nname='release-only'\nversion='0.1.0'\nedition='2024'\n",
    )
    .unwrap();
    std::fs::write(root.join("main.rs"), "#[cfg(not(test))] compile_error!(\"release-only error\"); fn main() {} #[test] fn passes() {}\n").unwrap();
    let error = build(&world, "release").await.unwrap_err();
    assert!(
        error["data"]["output"]
            .as_str()
            .unwrap()
            .contains("release-only error")
    );
    assert_eq!(error["data"]["tests"]["passed"], 1);
}
/// T23: cancellation retains serialization until a blocking source copy completes.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn cancelled_preparation_is_serialized() {
    let world = TestWorld::new();
    let first = world.0.join("first");
    let second = world.0.join("second");
    for (root, name) in [(&first, "first"), (&second, "second")] {
        std::fs::create_dir_all(root.join("src")).unwrap();
        std::fs::write(
            root.join("Cargo.toml"),
            format!("[package]\nname='{name}'\nversion='0.1.0'\nedition='2024'\n"),
        )
        .unwrap();
        std::fs::write(root.join("src/main.rs"), "fn main() {}\n").unwrap();
    }
    for number in 0..10000 {
        std::fs::write(first.join(format!("old-{number}")), "copy").unwrap();
    }
    let builder = std::sync::Arc::new(
        sausage::cargo::Cargo::with_runner(
            World::open(&world.0).unwrap(),
            PathBuf::from(env!("CARGO_BIN_EXE_sausage")),
            Path::new(CACHE),
        )
        .unwrap(),
    );
    let copying = builder.clone();
    let task = tokio::spawn(async move { copying.build(&first).await });
    tokio::time::timeout(std::time::Duration::from_secs(30), async {
        loop {
            if std::fs::read_dir(world.0.join("state/cargo/work"))
                .is_ok_and(|entries| entries.count() > 10)
            {
                break;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    task.abort();
    let _ = task.await;
    builder.build(&second).await.unwrap();
    assert!(
        !std::fs::read_dir(world.0.join("state/cargo/work"))
            .unwrap()
            .any(|entry| entry
                .unwrap()
                .file_name()
                .to_string_lossy()
                .starts_with("old-"))
    );
}
/// T23: multiple binary artifacts fail clearly instead of publishing an arbitrary binary.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn multiple_binaries() {
    let world = TestWorld::new();
    let root = world.0.join("plugins/multi/source/src/bin");
    std::fs::create_dir_all(&root).unwrap();
    std::fs::write(
        root.parent().unwrap().parent().unwrap().join("Cargo.toml"),
        "[package]\nname='multiple'\nversion='0.1.0'\nedition='2024'\n",
    )
    .unwrap();
    for name in ["one", "two"] {
        std::fs::write(root.join(format!("{name}.rs")), "fn main() {}\n").unwrap();
    }
    let error = build(&world, "multi").await.unwrap_err();
    assert!(
        error["data"]["output"]
            .as_str()
            .unwrap()
            .contains("exactly one binary")
    );
}
/// PROTOCOL 11: a valid SDK plugin builds and publishes a release component without activation.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn valid_build() {
    let valid = valid().await;
    let wasm = valid.result["wasm"].as_str().unwrap();
    assert!(wasm.starts_with("/state/cargo/builds/"));
    assert!(valid.world.0.join(wasm.trim_start_matches('/')).is_file());
    assert_eq!(valid.result["tests"]["passed"], 12);
    assert_eq!(valid.result["tests"]["failed"], 0);
    assert!(!valid.world.0.join("plugins/valid/plugin.wasm").exists());
    assert!(!valid.world.0.join("state/cargo/target").exists());
    assert!(
        Path::new(CACHE)
            .join("cargo-target/wasm32-wasip2/release")
            .is_dir()
    );
}
/// PROTOCOL 11: tests and compilation share one source copy without target metadata.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn source_copy() {
    let valid = valid().await;
    assert!(
        !valid
            .world
            .0
            .join("state/cargo/work/target/excluded")
            .exists()
    );
    assert!(
        std::fs::read_to_string(valid.world.0.join("state/cargo/work/Cargo.toml"))
            .unwrap()
            .contains(Path::new(CACHE).join("sdk").to_str().unwrap())
    );
}
/// PROTOCOL 11: compiler failures return compiler diagnostics.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn compile_error() {
    let world = TestWorld::new();
    world.source("bad", &fixture("cargo-fail"));
    let error = build(&world, "bad").await.unwrap_err();
    assert!(
        error["data"]["tests"]["output"]
            .as_str()
            .unwrap()
            .contains("error")
    );
}
/// PROTOCOL 11: a failing test rejects the build with its test output.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn failing_test() {
    let world = TestWorld::new();
    world.source("bad", &fixture("cargo-test-fail"));
    let error = build(&world, "bad").await.unwrap_err();
    assert_eq!(error["data"]["tests"]["failed"], 1);
    assert!(
        error["data"]["tests"]["output"]
            .as_str()
            .unwrap()
            .contains("deliberate WASI panic")
    );
}
/// PROTOCOL 11: one panic does not prevent another test instance from passing.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn panic_is_isolated() {
    let world = TestWorld::new();
    world.source("bad", &fixture("cargo-test-fail"));
    let error = build(&world, "bad").await.unwrap_err();
    assert_eq!(error["data"]["tests"]["passed"], 1);
}
/// PROTOCOL 11: build scripts can compile and link WASI C code.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn c_build() {
    let world = TestWorld::new();
    world.source("c", &fixture("cargo-c"));
    let result = build(&world, "c")
        .await
        .unwrap_or_else(|error| panic!("{error}"));
    assert_eq!(result["tests"]["passed"], 1);
}
/// PROTOCOL 11: libtest name filters select only matching tests.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn name_filter() {
    let output = runner(valid().await, &["arithmetic"]).await;
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert!(String::from_utf8_lossy(&output.stdout).contains("1 passed; 0 failed"));
}
/// PROTOCOL 11: --ignored selects ignored tests instead of normal tests.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn ignored_filter() {
    let output = runner(valid().await, &["--ignored"]).await;
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert!(String::from_utf8_lossy(&output.stdout).contains("test tests::ignored_case ... ok"));
}
/// PROTOCOL 11: CARGO_MANIFEST_DIR fixture reads work at the package's absolute host path.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn manifest_fixture() {
    let output = runner(valid().await, &["fixture_at_manifest_path"]).await;
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
}
/// PROTOCOL 11: WASI Preview 2 keeps cwd at / despite PWD. Absolute manifest paths reach fixtures.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn current_folder() {
    let valid = valid().await;
    let output = runner(valid, &["current_directory"]).await;
    let text = String::from_utf8_lossy(&output.stdout);
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert!(
        text.lines()
            .any(|line| line.ends_with("WASI_CURRENT_DIR=/")),
        "{text}"
    );
}
/// PROTOCOL 11: the SDK can acquire and release locks through the runner's core transport.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn sdk_lock() {
    let output = runner(valid().await, &["sdk_lock"]).await;
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
}
/// PROTOCOL 11: calls to other plugins fail with a clear runner error.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn unavailable_plugin() {
    let output = runner(valid().await, &["other_plugin_fails"]).await;
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
}
/// PROTOCOL 11: the notes example tests run in isolated worlds under the same runner.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn notes_example() {
    let world = TestWorld::new();
    world.source(
        "notes",
        &Path::new(env!("CARGO_MANIFEST_DIR"))
            .parent()
            .unwrap()
            .join("examples/notes"),
    );
    let result = build(&world, "notes")
        .await
        .unwrap_or_else(|error| panic!("{error}"));
    assert!(result["tests"]["passed"].as_u64().unwrap() > 0);
}
/// PROTOCOL 11: SDK installation leaves unchanged files and manifests untouched.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn unchanged_sdk() {
    let world = TestWorld::new();
    let setup = || {
        sausage::cargo::Cargo::with_runner(
            World::open(&world.0).unwrap(),
            PathBuf::from(env!("CARGO_BIN_EXE_sausage")),
            Path::new(CACHE),
        )
        .unwrap()
    };
    setup();
    let manifest = world.0.join("plugins/cargo/sdk/Cargo.toml");
    let modified = std::fs::metadata(&manifest).unwrap().modified().unwrap();
    setup();
    assert_eq!(
        std::fs::metadata(manifest).unwrap().modified().unwrap(),
        modified
    );
}
/// PROTOCOL 11: init can build a plugin without a running host.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn standalone_builder() {
    let world = TestWorld::new();
    world.source("simple", &fixture("cargo-test-fail"));
    let builder = sausage::cargo::Cargo::with_runner(
        World::open(&world.0).unwrap(),
        PathBuf::from(env!("CARGO_BIN_EXE_sausage")),
        Path::new(CACHE),
    )
    .unwrap();
    assert_eq!(
        builder
            .build(&world.0.join("plugins/simple/source"))
            .await
            .unwrap_err()
            .tests
            .failed,
        1
    );
}
/// PROTOCOL 11: killing a native build also kills its build-script descendants.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn kill_process_group() {
    assert!(
        Path::new("/proc/self/stat").is_file(),
        "process-group checks require /proc"
    );
    let world = TestWorld::new();
    world.source("hang", &fixture("cargo-hang"));
    let host = Host::start_with_cache(&world.0, Path::new(CACHE))
        .await
        .unwrap();
    let building = host.clone();
    let task =
        tokio::spawn(async move { building.call("cargo.build", json!({"plugin":"hang"})).await });
    let child = tokio::time::timeout(std::time::Duration::from_secs(120), async {
        loop {
            if let Ok(text) = std::fs::read_to_string(world.0.join("state/cargo/work/child.pid"))
                && let Ok(pid) = text.trim().parse::<u32>()
            {
                break pid;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    let mut ancestor = child;
    loop {
        let command = std::fs::read(format!("/proc/{ancestor}/cmdline")).unwrap();
        let arguments: Vec<_> = command
            .split(|byte| *byte == 0)
            .map(|part| String::from_utf8_lossy(part).to_string())
            .collect();
        if arguments[0].ends_with("/cargo") || arguments[0] == "cargo" {
            assert!(!arguments.iter().any(|arg| arg == "--offline"));
            assert!(
                arguments
                    .iter()
                    .any(|arg| arg.starts_with("target.wasm32-wasip2.runner=["))
            );
            assert_eq!(
                std::fs::read_link(format!("/proc/{ancestor}/fd/0")).unwrap(),
                PathBuf::from("/dev/null")
            );
            break;
        }
        let status = std::fs::read_to_string(format!("/proc/{ancestor}/status")).unwrap();
        ancestor = status
            .lines()
            .find_map(|line| line.strip_prefix("PPid:"))
            .unwrap()
            .trim()
            .parse()
            .unwrap();
        assert!(ancestor > 1, "cargo ancestor not found");
    }
    let pid = host
        .processes()
        .into_iter()
        .find(|(_, process)| process.plugin == "cargo")
        .unwrap()
        .0;
    let fs = host.filesystem().await.unwrap();
    use sausage_vfs::Layer;
    assert!(
        fs.stat(&format!("/proc/{pid}/info.json"), true)
            .await
            .is_ok()
    );
    assert!(
        !host
            .call("core.log", json!({"pid":pid,"grep":"start build"}))
            .await
            .unwrap()
            .as_array()
            .unwrap()
            .is_empty()
    );
    host.call("core.kill", json!({"pid":pid})).await.unwrap();
    assert!(task.await.unwrap().is_err());
    tokio::time::timeout(std::time::Duration::from_secs(10), async {
        loop {
            let status = std::fs::read_to_string(format!("/proc/{child}/stat"));
            if match status {
                Ok(status) => status.split_whitespace().nth(2) == Some("Z"),
                Err(error) if error.kind() == std::io::ErrorKind::NotFound => true,
                Err(error) => panic!("read /proc/{child}/stat: {error}"),
            } {
                break;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    host.stop().await;
}