Preflight and integration npx (#1096)

integration-tests/replace.test.js

@@ -0,0 +1,22 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { test } from 'node:test';
+import { strict as assert } from 'assert';
+import { TestRig } from './test-helper.js';
+
+test('should be able to replace content in a file', async (t) => {
+  const rig = new TestRig();
+  rig.setup(t.name);
+
+  const fileName = 'file_to_replace.txt';
+  rig.createFile(fileName, 'original content');
+  const prompt = `Can you replace 'original' with 'replaced' in the file 'file_to_replace.txt'`;
+
+  await rig.run(prompt);
+  const newFileContent = rig.readFile(fileName);
+  assert.strictEqual(newFileContent, 'replaced content');
+});