update test:integration to work with latest execa

package.json

@@ -26,7 +26,7 @@
     "lint": "eslint . --cache",
     "release": "release-it",
     "test": "codemod-cli test --coverage",
-    "test:integration": "node ./test/run-test.js",
+    "test:integration": "node ./test/run-test.mjs",
     "test:notelemetry": " node ./test/run-test-without-telemetry.js"
   },
   "jest": {

test/run-test.mjs

@@ -0,0 +1,58 @@
+/* eslint-disable no-console */
+
+import { spawn } from 'child_process';
+import { execa } from 'execa';
+import path from 'path';
+
+// resolved from the root of the project
+const inputDir = path.resolve('./test/fixtures/input');
+const execOpts = { cwd: inputDir, stderr: 'inherit' };
+
+
+console.log('installing deps');
+
+await execa('rm', ['-rf', 'node_modules'], execOpts);
+await execa('yarn', ['install'], execOpts);
+
+console.log('starting serve');
+
+// We use spawn for this one so we can kill it later without throwing an error
+const emberServe = spawn('yarn', ['start'], execOpts);
+emberServe.stderr.pipe(process.stderr);
+emberServe.stdout.pipe(process.stdout);
+
+await new Promise((resolve) => {
+  emberServe.stdout.on('data', (data) => {
+    if (data.toString().includes('Build successful')) {
+      resolve();
+    }
+  });
+});
+
+console.log('running codemod');
+
+const codemod = execa(
+  '../../../bin/cli.js',
+  ['--telemetry', 'http://localhost:4200', 'app'],
+  execOpts
+);
+codemod.stdout.pipe(process.stdout);
+await codemod;
+
+console.log('codemod complete, ending serve');
+
+emberServe.kill('SIGTERM');
+
+console.log('comparing results');
+
+try {
+  await execa('diff', ['-rq', './app', '../output/app'], execOpts);
+} catch (e) {
+  console.error('codemod did not run successfully');
+  console.log(e);
+
+  process.exit(1);
+}
+
+console.log('codemod ran successfully! 🎉');
+process.exit(0);