Testing more methods

src/main/java/com/zipcodewilmington/phonebook/PhoneBook.java

@@ -59,9 +59,13 @@ public class PhoneBook {
         }
 
         public String listNamesAndNumbers(){
-        Set<String>PhoneBookList = phoneBook.keySet();
-            for (String nameKeys:phoneBookList) {
-                namesAndNumbers+=nameKeys + "   "+phoneBook.get(nameKeys)+ "\n";
+            if(phoneBook.isEmpty()){
+                return null;
+            }else {
+                Set<String> PhoneBookList = phoneBook.keySet();
+                for (String nameKeys : phoneBookList) {
+                    namesAndNumbers += nameKeys + "   " + phoneBook.get(nameKeys) + "\n";
+                }
             }
 
         return namesAndNumbers;

src/test/java/com/zipcodewilmington/phonebook/PhoneBookTest.java

@@ -37,12 +37,23 @@ public class PhoneBookTest {
         String actual = phoneBookRecord.lookup("Micheal");
         Assert.assertEquals(expected, actual);
     }
-    public void testlistNames(){
-        String expected = "John\n" +
-                            "Micheal\n"+
-                            "James\n";
+    @Test
+    public void testListNames(){
+        String expected = "James\n" +
+                            "John\n"+
+                            "Micheal\n";
         String actual = phoneBookRecord.listNames();
         Assert.assertEquals(expected, actual);
 
     }
+    @Test
+    public void testListNumbersAndNumbers(){
+        String expected = "James    "+ "1234554321\n"+
+                "John   "+"1234567890\n"+
+                "Micheal    "+"5678901234";
+        String actual =phoneBookRecord.listNamesAndNumbers();
+        Assert.assertEquals(expected, actual);
+    }
+
+
 }