// test getting null property id (#10445)
 @Test
 public void testNullPropertyId() {
   IndexedContainer ic = new IndexedContainer();
   String object1 = new String("Obj1");
   ic.addItem(object1);
   assertNull(ic.getContainerProperty(object1, null));
 }
 // test getting non-existing property (#10445)
 @Test
 public void testNonExistingProperty() {
   IndexedContainer ic = new IndexedContainer();
   String object1 = new String("Obj1");
   ic.addItem(object1);
   assertNull(ic.getContainerProperty(object1, "xyz"));
 }