'Ensure single asset blocks with the wrong tag are detected.'

def test_wrong_node_type_single(self):

    asset_md = self.course_assets[0]
    root = etree.Element('assets')
    asset = etree.SubElement(root, 'smashset')
    with self.assertRaises(ContractNotRespected):
        asset_md.to_xml(asset)
