diff --git a/test/demo/detect.js b/test/demo/detect.js
new file mode 100644
index 0000000..2e6e684
--- /dev/null
+++ b/test/demo/detect.js
@@ -0,0 +1,9 @@
+import { detect } from '../../dist/esm/index.js';
+
+detect(7001)
+  .then(port => {
+    console.log(port);
+  })
+  .catch(err => {
+    console.error(err);
+  });
diff --git a/test/demo/server.js b/test/demo/server.js
new file mode 100644
index 0000000..bfb67a0
--- /dev/null
+++ b/test/demo/server.js
@@ -0,0 +1,8 @@
+import { createServer } from 'node:http';
+import { hostname } from 'node:os';
+
+const server = createServer();
+
+server.listen(7001, hostname(), () => {
+  console.log('listening %s:7001, address: %o', hostname(), server.address());
+});
diff --git a/test/detect-port.test.ts b/test/detect-port.test.ts
index 5611e10..a454a44 100644
--- a/test/detect-port.test.ts
+++ b/test/detect-port.test.ts
@@ -44,6 +44,13 @@ describe('test/detect-port.test.ts', () => {
       });
       servers.push(server4);
 
+      const server5 = new net.Server();
+      server5.listen(25500, '::1', cb);
+      server5.on('error', err => {
+        console.error('listen ::1 error:', err);
+      });
+      servers.push(server5);
+
       for (let port = 27000; port < 27010; port++) {
         const server = new net.Server();
         if (port % 3 === 0) {
@@ -102,6 +109,13 @@ describe('test/detect-port.test.ts', () => {
       assert.equal(realPort, 25001);
     });
 
+    it('work with listening next port 25501 because 25500 was listened to ::1', async () => {
+      const port = 25500;
+      const realPort = await detectPort(port);
+      assert(realPort);
+      assert.equal(realPort, 25501);
+    });
+
     it('should listen next port 24001 when localhost is not binding', async () => {
       mm(dns, 'lookup', (...args: any[]) => {
         mm.restore();