Fix in DAO Tests

Author: MrGoumX

app/src/test/java/gr/aueb/se/labadministration/services/LabServiceStub.java

@@ -35,6 +35,11 @@ public void remove(Laboratory laboratory) {
 
             }
 
+            @Override
+            public void addTerminal(Laboratory laboratory, Terminal terminal) {
+
+            }
+
             @Override
             public Laboratory findByName(String name) {
                 if (name==null) return null;