Merge pull request #731 from McEileen/rna-transcription-invalid-input

Add tests to catch invalid input edge cases

exercises/rna-transcription/src/example/java/RnaTranscription.java

                 case 'T':
                     sb.append('A');
                     break;
+                default:
+                    throw new IllegalArgumentException("Invalid input");
+
             }
         }
         return sb.toString();

exercises/rna-transcription/src/test/java/RnaTranscriptionTest.java

 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.Rule;
 
 public class RnaTranscriptionTest {
 
+    /*
+    version: 2.0.0
+     */
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
     private RnaTranscription rnaTranscription;
 
     @Before
     public void testRnaTranscription() {
         Assert.assertEquals("UGCACCAGAAUU", rnaTranscription.transcribe("ACGTGGTCTTAA"));
     }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testRnaTranscriptionOfRnaThrowsAnError() {
+        thrown.expect(IllegalArgumentException.class);
+        thrown.expectMessage("Invalid input");
+        rnaTranscription.transcribe("U");
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testRnaTranscriptionOfInvalidInputThrowsAnError() {
+        thrown.expect(IllegalArgumentException.class);
+        thrown.expectMessage("Invalid input");
+        rnaTranscription.transcribe("BFV");
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testRnaTranscriptionOfPartiallyInvalidInput() {
+        thrown.expect(IllegalArgumentException.class);
+        thrown.expectMessage("Invalid input");
+        rnaTranscription.transcribe("GCVV");
+    }
 }