test(integration): Add "Ctrl + C" to exit integration test (#9272)

integration-tests/ctrl-c-exit.test.ts

@@ -0,0 +1,54 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { TestRig } from './test-helper.js';
+
+describe('Ctrl+C exit', () => {
+  it('should exit gracefully on second Ctrl+C', async () => {
+    const rig = new TestRig();
+    await rig.setup('should exit gracefully on second Ctrl+C');
+
+    const { ptyProcess, promise } = rig.runInteractive();
+
+    let output = '';
+    ptyProcess.onData((data) => {
+      output += data;
+    });
+
+    // Wait for the app to be ready by looking for the initial prompt indicator
+    await rig.poll(() => output.includes('▶'), 5000, 100);
+
+    // Send first Ctrl+C
+    ptyProcess.write('\x03');
+
+    // Wait for the exit prompt
+    await rig.poll(
+      () => output.includes('Press Ctrl+C again to exit'),
+      1500,
+      50,
+    );
+
+    // Send second Ctrl+C
+    ptyProcess.write('\x03');
+
+    const result = await promise;
+
+    // Expect a graceful exit (code 0)
+    expect(
+      result.exitCode,
+      `Process exited with code ${result.exitCode}. Output: ${result.output}`,
+    ).toBe(0);
+
+    // Check that the quitting message is displayed
+    const quittingMessage = 'Agent powering down. Goodbye!';
+    // The regex below is intentionally matching the ESC control character (\x1b)
+    // to strip ANSI color codes from the terminal output.
+    // eslint-disable-next-line no-control-regex
+    const cleanOutput = output.replace(/\x1b\[[0-9;]*m/g, '');
+    expect(cleanOutput).toContain(quittingMessage);
+  });
+});