'Test coverage which shows that for now xml read operations are not implemented'

@ddt.data(XmlModulestoreBuilder(), MixedModulestoreBuilder([('xml', XmlModulestoreBuilder())]))
def test_xml_not_yet_implemented(self, storebuilder):

    with storebuilder.build(contentstore=None) as (__, store):
        course_key = store.make_course_key('org', 'course', 'run')
        asset_key = course_key.make_asset_key('asset', 'foo.jpg')
        self.assertEquals(store.find_asset_metadata(asset_key), None)
        self.assertEquals(store.get_all_asset_metadata(course_key, 'asset'), [])
