saved_references demodata, small ui tweaks and cancel option for adding optional fields

Author: sjsarsa

ReferenceLibrary/saved_references

@@ -86,7 +86,7 @@ private void addNewReference() {
                 io.print("Reference added!");
                 break;
             case "o":
-                io.print("--adding other not implement");
+                io.print("--adding other not implemented");
                 //io.print("Reference added!");
                 break;
         } 

ReferenceLibrary/src/main/java/referencelibrary/ui/UI.java

@@ -72,11 +72,13 @@ private void showValidOptionalFields(Reference reference) {
     private void addOptionalFieldToReference(Reference reference) {
         String fieldName;
         String fieldValue;
-
+        
+        io.print("Enter 'c' to cancel");
         do {
-            fieldName = io.readLine("Field:");
-        } while (!validator.fieldNameIsValid(fieldName, reference));
-
+            fieldName = io.readLine("field:");
+        } while (!validator.fieldNameIsValid(fieldName, reference) && fieldName.equals("c"));
+        
+        if (fieldName.equals("c")) return;
         do {
             fieldValue = io.readLine(fieldName + ":");
         } while (!validator.fieldValueIsValid(fieldValue));

ReferenceLibrary/src/main/java/referencelibrary/ui/command/AddOptionalFieldsSubCommand.java

@@ -23,8 +23,6 @@ public void setUp() {
 
     @Test
     public void testConstructor() {
-        reference = new ArticleReference();
-        reference.setReferenceName("my_article");
         assertEquals("my_article", reference.getReferenceName());
         assertEquals(ReferenceType.REFERENCE_ARTICLE, reference.getReferenceType());
         assertTrue(reference.getFieldValues().isEmpty());