title: Junit preview window not showing in eclipse?
body: <p>I'm trying to run a simple JUnit test in Eclipse, but the preview pane with the very noticeable green/red bar will not show, instead it only shows the normal console window.</p>
  
  <p>I checked that I run JUnit 4 in the run configuration.</p>
  
  <pre><code>import static org.junit.Assert.*;
  import org.junit.Test;
  
  public class TestF {
  
    @Test
    public void test() {
      AClass a = new AClass();
      int t = a.Double(2);
      assertEquals(4, t);
    }
  }
  </code></pre>