Tests for file structure

idea/src/org/jetbrains/jet/plugin/structureView/JetStructureViewElement.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2013 JetBrains s.r.o.
+ * Copyright 2010-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -78,6 +78,7 @@ public class JetStructureViewElement implements StructureViewTreeElement {
         return myElement.canNavigateToSource();
     }
 
+    @NotNull
     @Override
     public ItemPresentation getPresentation() {
         return new ColoredItemPresentation() {
@@ -115,6 +116,7 @@ public class JetStructureViewElement implements StructureViewTreeElement {
         };
     }
 
+    @NotNull
     @Override
     public TreeElement[] getChildren() {
         if (myElement instanceof JetFile) {