use a tag instead of button tag

Author: koba04

packages/enzyme-test-suite/test/ShallowWrapper-spec.jsx

@@ -2474,13 +2474,13 @@ describe('shallow', () => {
         render() {
           return (
             <div>
-              <a onClick={spy}>foo</a>
+              <button onClick={spy}>foo</button>
             </div>
           );
         }
       }
       const wrapper = shallow(<Foo />);
-      const value = wrapper.find('a').invoke('onClick');
+      const value = wrapper.find('button').invoke('onClick');
       expect(value).to.equal(123);
       expect(spy.called).to.equal(true);
     });
@@ -2490,15 +2490,15 @@ describe('shallow', () => {
         render() {
           return (
             <div>
-              <a onClick={spy}>foo</a>
+              <button onClick={spy}>foo</button>
             </div>
           );
         }
       }
       const wrapper = shallow(<Foo />);
       const a = {};
       const b = {};
-      wrapper.find('a').invoke('onClick', a, b);
+      wrapper.find('button').invoke('onClick', a, b);
       expect(spy.args[0][0]).to.equal(a);
       expect(spy.args[0][1]).to.equal(b);
     });