diff --git a/components/input/__tests__/index.test.js b/components/input/__tests__/index.test.js
new file mode 100644
index 0000000000..17db54d021
--- /dev/null
+++ b/components/input/__tests__/index.test.js
@@ -0,0 +1,23 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import Input from '..';
+
+jest.mock('../calculateNodeHeight');
+const calculateNodeHeight = require('../calculateNodeHeight');
+
+const delay = timeout => new Promise(resolve => setTimeout(resolve, timeout));
+
+describe('Input', () => {
+  it('should auto calculate height according to content length', async () => {
+    const wrapper = mount(
+      <Input type="textarea" autosize />
+    );
+    expect(calculateNodeHeight).toHaveBeenCalledTimes(1);
+    wrapper.setProps({ value: '1111\n2222\n3333' });
+    await delay(0);
+    expect(calculateNodeHeight).toHaveBeenCalledTimes(2);
+    wrapper.setProps({ value: '1111' });
+    await delay(0);
+    expect(calculateNodeHeight).toHaveBeenCalledTimes(3);
+  });
+});