def test_min_max(self):
"""Test the min and max of the interval."""
atoms = [(0, 2), (8, 2), (4, 2)]
ival = Interval.fromAtoms(atoms)
self.assertEquals(ival.min(), 0)
self.assertEquals(ival.max(), 9)
ival = Interval.fromAtom(5, 1)
self.assertEquals(ival.min(), 5)
self.assertEquals(ival.max(), 5)
ival = Interval()
self.assertIsNone(ival.min())
self.assertIsNone(ival.max())
