title: why react-router V4 component not loading?
body: <p>I have an Home component and this is inside of it:</p>
  
  <pre><code>{posts &amp;&amp; posts.map(post =&gt; (
    &lt;div key={post.id}&gt;
    &lt;Link to="/test"&gt;{post.title}&lt;/Link&gt;
    &lt;/div&gt;
  ))}
  &lt;Route path="/test" component={Test} /&gt; 
  </code></pre>
  
  <p></p>
  
  <p>this is my app.js</p>
  
  <pre><code>&lt;Topnav /&gt;        
  &lt;Switch&gt;
    &lt;Route exact path = '/' component={Home} /&gt;
    &lt;Route path = '/posts/create' component={Postform} /&gt;        
  &lt;/Switch&gt;
  </code></pre>
  
  <p>Why is this test not working when I click it? It goes the the url but the Test component should say <code>I AM TEST</code>!</p>
  
  <pre><code>class Test extends Component {
    render() {
      return (
        &lt;div&gt;
          &lt;h1&gt;I AM TEST&lt;/h1&gt;  
        &lt;/div&gt;
      );
    }
  }
  </code></pre>