public class RnaTranscription {
    public String ofDna(String dnaString) { return null; }
}
@@ -72,21 +72,101 @@
 g) %7B
- return null;
+%0A        throw new UnsupportedOperationException(%22Method has not been implemented yet.%22);%0A   
  %7D%0A%7D

throw exception in starter implementation