runs npm smoke test through node

.github/workflows/test.yml

@@ -1,6 +1,7 @@
 name: test
 
 on:
+  workflow_dispatch:
   pull_request:
   push:
 

package.json

@@ -24,7 +24,7 @@
   "scripts": {
     "build": "tsc -p tsconfig.json && node -e \"require('node:fs').chmodSync('dist/cli.js', 0o755)\"",
     "clean": "node -e \"require('node:fs').rmSync('dist', { recursive: true, force: true })\"",
-    "test": "npm run build && node --test test/*.test.mjs",
+    "test": "npm run build && node --test test/detector.test.mjs test/package.test.mjs",
     "prepack": "npm run clean && npm test"
   },
   "keywords": [

test/package.test.mjs

@@ -6,15 +6,13 @@ import path from "node:path";
 import { fileURLToPath } from "node:url";
 import test from "node:test";
 
-const npm = process.platform === "win32" ? "npm.cmd" : "npm";
 const projectRoot = path.resolve(fileURLToPath(new URL("..", import.meta.url)));
 
 test("packed package can be installed, imported, and run as a CLI", () => {
   const workspace = mkdtempSync(path.join(tmpdir(), "agent-cli-detector-"));
 
   try {
-    const packOutput = execFileSync(
-      npm,
+    const packOutput = execNpm(
       ["pack", "--ignore-scripts", "--json", "--pack-destination", workspace],
       {
         cwd: projectRoot,
@@ -60,7 +58,7 @@ test("packed package can be installed, imported, and run as a CLI", () => {
     ]);
 
     writeFileSync(path.join(workspace, "package.json"), '{"type":"module"}\n');
-    execFileSync(npm, ["install", "--ignore-scripts", "--no-audit", "--no-fund", tarball], {
+    execNpm(["install", "--ignore-scripts", "--no-audit", "--no-fund", tarball], {
       cwd: workspace,
       stdio: "pipe"
     });
@@ -118,3 +116,12 @@ test("packed package can be installed, imported, and run as a CLI", () => {
     rmSync(workspace, { recursive: true, force: true });
   }
 });
+
+function execNpm(args, options) {
+  if (process.env.npm_execpath !== undefined) {
+    return execFileSync(process.execPath, [process.env.npm_execpath, ...args], options);
+  }
+
+  const npm = process.platform === "win32" ? "npm.cmd" : "npm";
+  return execFileSync(npm, args, options);
+}