title: How can i test a component with setProps() of enzyme
body: <pre><code>//in my component i have 
  
  {this.props.auth.isLoadding &amp;&amp; 
     &lt;p className='text-info positionMessage'&gt;Is registring...&lt;/p&gt;
  }
  
  //in my test i have 
  
  it('should start a new component with set props', () =&gt; {
  const props = {
      auth: {
          isAuth: false,
          isLoadding: false
      }
  }
      const wrapper = shallow(&lt;ScreensCreateAccount {...props}/&gt;)
  
      wrapper.setProps({isLoadding: true})
      //here is code for testing if &lt;p&gt;...&lt;/p&gt; appeared. how can i do this?
  })
  </code></pre>
  
  <p>my component starts with <code>this.props.auth.isLoadding = false</code>, and when a change it for true, the html too change, adding <code>&lt;p className='text-info positionMessage'&gt;Is registring...&lt;/p&gt;</code>. How can i test it using shallow from enzyme? </p>