do not miss last event that all class tests were run (IDEA-56916)

plugins/junit/src/com/intellij/execution/junit2/TestProxy.java

@@ -78,7 +78,7 @@ public class TestProxy extends AbstractTestProxy {
     }
   }
 
-  private void fireStateChanged() {
+  public void fireStateChanged() {
     myStateTimestamp++;
     pullEvent(new StateChangedEvent(this));
     if (myParent != null)

plugins/junit/src/com/intellij/execution/junit2/ui/TestsPacketsReceiver.java

@@ -255,6 +255,7 @@ public class TestsPacketsReceiver implements PacketProcessor, Disposable {
         if (parentState instanceof SuiteState) {
           if (!child.isInProgress() && child.equals(children.get(children.size() - 1))) {
             ((SuiteState)parentState).setRunning(false);
+            parent.fireStateChanged();
             parent.flush();
           }
           ((SuiteState)parentState).updateMagnitude(magnitude);