@Test(expected = SidoClosedItemException.class)
 public void addType_closed() {
   SidoContext context = mock(SidoContext.class);
   DefaultSidoSchema schema = new DefaultSidoSchema(context, UID);
   schema.close();
   schema.addType(mock(SidoType.class));
 }
 @Test
 public void addType() {
   SidoContext context = mock(SidoContext.class);
   DefaultSidoSchema schema = new DefaultSidoSchema(context, UID);
   SidoType type = mock(SidoType.class);
   when(type.getName()).thenReturn("Person");
   schema.addType(type);
   assertSame(type, schema.getType("Person", true));
 }