def test_preferred_tags(self):
"""
Testing preferred magnitude, origin and focal mechanism tags
"""
# testing empty event
ev = Event()
self.assertEqual(ev.preferred_origin(), None)
self.assertEqual(ev.preferred_magnitude(), None)
self.assertEqual(ev.preferred_focal_mechanism(), None)
# testing existing event
filename = os.path.join(self.path, 'preferred.xml')
catalog = read_events(filename)
self.assertEqual(len(catalog), 1)
ev_str = "Event:\t2012-12-12T05:46:24.120000Z | +38.297, +142.373 " + \
"| 2.0 MW"
self.assertIn(ev_str, str(catalog.events[0]))
# testing ids
ev = catalog.events[0]
self.assertEqual('smi:orig2', ev.preferred_origin_id)
self.assertEqual('smi:mag2', ev.preferred_magnitude_id)
self.assertEqual('smi:fm2', ev.preferred_focal_mechanism_id)
# testing objects
self.assertEqual(ev.preferred_origin(), ev.origins[1])
self.assertEqual(ev.preferred_magnitude(), ev.magnitudes[1])
self.assertEqual(
ev.preferred_focal_mechanism(), ev.focal_mechanisms[1])
