test(parallels): clean up npm update guard jobs

test/scripts/parallels-npm-update-smoke.test.ts

@@ -0,0 +1,14 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+const SCRIPT_PATH = "scripts/e2e/parallels-npm-update-smoke.sh";
+
+describe("parallels npm update smoke", () => {
+  it("does not leave guard/server children attached to the wrapper", () => {
+    const script = readFileSync(SCRIPT_PATH, "utf8");
+
+    expect(script).toContain('wait "$SERVER_PID" 2>/dev/null || true');
+    expect(script).toContain(") >&2 &");
+    expect(script).toContain('wait "$pid" 2>/dev/null || true');
+  });
+});