def test_add_delete_update_reference(self):
doc = BioDesDoc().from_xml(self.create_element())
self.assertEqual(len(doc.get_references()), 0)
_ref1 = doc.add_reference(uri='http://someref', text='some text')
self.assertEqual(len(doc.get_references()), 1)
_ref2 = doc.add_reference(uri='http://someref2', text='some text2')
self.assertEqual(len(doc.get_references()), 2)
index1 = doc.get_references()[0][0]
index2 = doc.get_references()[1][0]
doc.remove_reference(index2)
self.assertEqual(len(doc.get_references()), 1)
ref1 = doc.update_reference(index=index1, uri='http://somerefx', text='some textx')
self.assertEqual(len(doc.get_references()), 1)
index, _ref = doc.get_references()[0]
self.assertEqual(index, 0)
self.assertEqual(ref1.get('target'), 'http://somerefx')
self.assertEqual(ref1.text, 'some textx')
