diff --git a/components/_util/__tests__/util.test.js b/components/_util/__tests__/util.test.js
index c56e320c4e..264becdc84 100644
--- a/components/_util/__tests__/util.test.js
+++ b/components/_util/__tests__/util.test.js
@@ -1,11 +1,14 @@
 import raf from 'raf';
 import React from 'react';
 import { mount } from 'enzyme';
+import KeyCode from 'rc-util/lib/KeyCode';
 import delayRaf from '../raf';
 import throttleByAnimationFrame from '../throttleByAnimationFrame';
 import getDataOrAriaProps from '../getDataOrAriaProps';
 import triggerEvent from '../triggerEvent';
 import Wave from '../wave';
+import TransButton from '../transButton';
+import openAnimation from '../openAnimation';
 
 describe('Test utils function', () => {
   beforeAll(() => {
@@ -163,5 +166,55 @@ describe('Test utils function', () => {
       ).instance();
       expect(wrapper.bindAnimationEvent()).toBe(undefined);
     });
+
+    it('should not throw when click it', () => {
+      expect(() => {
+        const wrapper = mount(<Wave><div /></Wave>);
+        wrapper.simulate('click');
+      }).not.toThrow();
+    });
+
+    it('should not throw when no children', () => {
+      expect(() => mount(<Wave />)).not.toThrow();
+    });
+  });
+
+  describe('TransButton', () => {
+    it('can be focus/blur', () => {
+      const wrapper = mount(
+        <TransButton>TransButton</TransButton>,
+      );
+      expect(typeof wrapper.instance().focus).toBe('function');
+      expect(typeof wrapper.instance().blur).toBe('function');
+    });
+
+    it('should trigger onClick when press enter', () => {
+      const onClick = jest.fn();
+      const preventDefault = jest.fn();
+      const wrapper = mount(
+        <TransButton onClick={onClick}>TransButton</TransButton>,
+      );
+      wrapper.simulate('keyUp', { keyCode: KeyCode.ENTER });
+      expect(onClick).toHaveBeenCalled();
+      wrapper.simulate('keyDown', { keyCode: KeyCode.ENTER, preventDefault });
+      expect(preventDefault).toHaveBeenCalled();
+    });
+  });
+
+  describe('openAnimation', () => {
+    it('should support openAnimation', () => {
+      const done = jest.fn();
+      const domNode = document.createElement('div');
+      expect(typeof openAnimation.enter).toBe('function');
+      expect(typeof openAnimation.leave).toBe('function');
+      expect(typeof openAnimation.appear).toBe('function');
+      const appear = openAnimation.appear(domNode, done);
+      const enter = openAnimation.enter(domNode, done);
+      const leave = openAnimation.leave(domNode, done);
+      expect(typeof appear.stop).toBe('function');
+      expect(typeof enter.stop).toBe('function');
+      expect(typeof leave.stop).toBe('function');
+      expect(done).toHaveBeenCalled();
+    });
   });
 });
diff --git a/components/_util/wave.tsx b/components/_util/wave.tsx
index abaf86e423..2185455ba6 100644
--- a/components/_util/wave.tsx
+++ b/components/_util/wave.tsx
@@ -158,7 +158,7 @@ export default class Wave extends React.Component<{ insertExtraNode?: boolean }>
 
   componentDidMount() {
     const node = findDOMNode(this) as HTMLElement;
-    if (node.nodeType !== 1) {
+    if (!node || node.nodeType !== 1) {
       return;
     }
     this.instance = this.bindAnimationEvent(node);