test: add integration test

- Test action execution with spawnSync
- Configure GitHub Actions runner environment variables
- Verify action completes successfully (exit code 0)

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: remarkablemark

src/index.integration.test.ts

@@ -0,0 +1,28 @@
+import { spawnSync } from 'node:child_process';
+import { resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { describe, expect, it } from 'vitest';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+const nodePath = process.execPath;
+const actionPath = resolve(__dirname, '../dist/index.js');
+const tmpPath = resolve(__dirname, '../node_modules/.tmp');
+
+describe('integration', () => {
+  it('runs action', () => {
+    const env = {
+      'INPUT_CLI-NAME': 'gh',
+      'INPUT_CLI-VERSION': '2.27.0',
+      RUNNER_TOOL_CACHE: resolve(tmpPath, 'runner_tool_cache'),
+      RUNNER_TEMP: resolve(tmpPath, 'runner_temp'),
+    };
+
+    const result = spawnSync(nodePath, [actionPath], {
+      env,
+      stdio: 'ignore', // 'inherit' to stream output in real-time
+    });
+
+    expect(result.status).toBe(0);
+  });
+});