fix test

Author: MinJieLiu

README.md

@@ -76,9 +76,6 @@ Finally, sets the initialized value:
 
 ```js
 <BasicForm
-  ref={(ref) => {
-    this.basicForm = ref;
-  }}
   classNames={{
     static: 'form-control',
     success: 'valid-success',

test/setup.js

@@ -19,6 +19,7 @@ describe('Test to create a basic form', () => {
     );
     expect(app.exists()).to.equal(true);
     expect(app.node.props.formControl).to.be.an.instanceOf(Object);
+    expect(app.node.props.formControl.formValues.email).to.be.empty;
   });
 
   it('The form attribute is correct', () => {