def test_properties(self):
"""Validate basic setters and getters."""
d = Datum(5., 'mmag', label='millimag', description='Hello world')
self.assertIsInstance(d.quantity, u.Quantity)
self.assertEqual(d.quantity.value, 5.)
d.quantity = 7 * u.mmag
self.assertEqual(d.quantity.value, 7)
self.assertEqual(d.unit_str, 'mmag')
self.assertEqual(d.unit, u.mmag)
# change units
d.quantity = 5 * u.mag
self.assertEqual(d.unit, u.mag)
self.assertEqual(d.label, 'millimag')
d.label = 'magnitudes'
self.assertEqual(d.label, 'magnitudes')
self.assertEqual(d.description, 'Hello world')
d.description = 'Updated description.'
self.assertEqual(d.description, 'Updated description.')
def test_quantity_update(self):
"""Verify that when a quantity is updated the unit attributes
are updated.
"""
d = Datum(5 * u.mag)
self.assertEqual(d.quantity.value, 5.)
self.assertEqual(d.unit_str, 'mag')
d.quantity = 100. * u.mmag
self.assertEqual(d.quantity.value, 100.)
self.assertEqual(d.unit_str, 'mmag')
