REPO-1813: 500 Response Code when creating a person without id

Now returns 400. Also fixed to return 400 when user id starts with GROUP_ or ROLE_

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@134714 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/test-java/org/alfresco/rest/api/tests/TestPeople.java

@@ -300,6 +300,19 @@ public class TestPeople extends EnterpriseTestApi
         person.setUserName("myUser/Name@" + account1.getId());
         people.create(person, 400);
 
+        // check for reserved authority prefixes
+        person.setUserName("GROUP_EVERYONE");
+        people.create(person, 400);
+
+        person.setUserName("GROUP_mygroup");
+        people.create(person, 400);
+
+        person.setUserName("ROLE_ANYTHING");
+        people.create(person, 400);
+
+        // lower case
+        person.setUserName("role_whatever");
+        people.create(person, 400);
     }
 
     @Test
@@ -456,10 +469,14 @@ public class TestPeople extends EnterpriseTestApi
 
         // -ve: not enough fields!
         {
-            // Create a person with no fields set.
+            // Create a person with no fields other than user ID set.
             Person person = new Person();
             person.setUserName("joe.bloggs.2@"+account1.getId());
             people.create(person, 400);
+
+            // Missing ID
+            person.setUserName(null);
+            people.create(person, 400);
         }
     }