def test_build_source_attributes(self):
header = EMBLHeader()
calculated_attributes=header.build_source_attributes(organism="an organism", taxon_id="TAX_ID", sequence_name="sequence_name")
expected_attributes = {"organism": "an organism", "db_xref": "taxon:TAX_ID", "note": "sequence_name"}
self.assertEqual(calculated_attributes, expected_attributes)
