title: JUnit nested test is not running
body: <p>I'm trying to write some nested tests using the <code>@Nested</code> annotation, but the Nested tests aren't run. For example:</p>
  <pre class="lang-java prettyprint-override"><code>import org.junit.Test;
  import org.junit.jupiter.api.Nested;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class SampleTest {
      @Test
      public void onePlusOneShouldBeTwo() {
          assertEquals(1 + 1, 2);
      }
  
      @Nested
      class NestedTest {
          @Test
          public void twoPlusTwoShouldBeFour() {
              assertEquals(2 + 2, 4);
          }
      }
  }
  </code></pre>
  <p>The outer test (<code>onePlusOneShouldBeTwo</code>) is ran, but the nested one (<code>twoPlusTwoShouldBeFour</code>) is not. Why is that?</p>