//! Integration guard: the `aura graph` viewer renders an explicit instance name
//! as a `name: ` prefix ahead of the type head, and leaves an unnamed leaf bare.
//!
//! Like `viewer_dot.rs`, the property lives in JavaScript (`cellLabel` in
//! assets/graph-viewer.js), so this shells out to `node` running the headless
//! guard `tests/viewer_name_prefix.mjs`, which loads the real viewer module and
//! drives the exported `genDot` over a minimal model (a named SMA + an unnamed
//! Sub).
//!
//! `node` is REQUIRED: if it is not on PATH this test FAILS (a skipped guard is
//! not a guard).

use std::path::PathBuf;
use std::process::Command;

#[test]
fn viewer_renders_name_prefix_for_named_leaf_only() {
    let script = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("tests")
        .join("viewer_name_prefix.mjs");
    assert!(
        script.exists(),
        "guard script missing at {}",
        script.display()
    );

    let out = match Command::new("node").arg(&script).output() {
        Ok(out) => out,
        Err(e) => panic!(
            "node is required for the viewer name-prefix guard but could not be run \
             ({e}); install Node.js or ensure `node` is on PATH"
        ),
    };

    let stdout = String::from_utf8_lossy(&out.stdout);
    let stderr = String::from_utf8_lossy(&out.stderr);
    assert!(
        out.status.success(),
        "viewer name-prefix guard failed (exit {:?}).\n--- node stdout ---\n{stdout}\n--- node stderr ---\n{stderr}",
        out.status.code()
    );
}