@Test(expected = InvalidArgumentException.class)
public void testTraverseGraphByObjectTypeValueWithoutObjectType() throws Exception {

  TraverseByObjectTypeValueRequest request = new TraverseByObjectTypeValueRequest().setType("type").setValue("value");
  doThrow(InvalidArgumentException.class).when(objectTypeHandler).assertObjectTypeExists(request.getType(), "type");
  delegate.handle(request);
}