def test_construct_compute_length(self):
# Type that supports subtraction
i = Interval(3, 8)
self.assertEqual(3, i.lo)
self.assertEqual(8, i.hi)
self.assertEqual(5, i.length())
# Type that does not support subtraction
i = Interval('2018-10-31', '2018-11-01')
self.assertEqual('2018-10-31', i.lo)
self.assertEqual('2018-11-01', i.hi)
self.assertEqual(None, i.length())
def test_construct_point(self):
# Types that support subtraction
i = Interval(3)
self.assertEqual(3, i.lo)
self.assertEqual(3, i.hi)
self.assertEqual(0, i.length())
i = Interval(datetime.date(2018, 10, 31))
self.assertEqual(datetime.date(2018, 10, 31), i.lo)
self.assertEqual(datetime.date(2018, 10, 31), i.hi)
self.assertEqual(datetime.timedelta(0), i.length())
# Type that does not support subtraction
i = Interval('2018-10-31')
self.assertEqual('2018-10-31', i.lo)
self.assertEqual('2018-10-31', i.hi)
self.assertEqual(0, i.length())
def test_construct_from_lo_length(self):
i = Interval(3, length=5)
self.assertEqual(3, i.lo)
self.assertEqual(8, i.hi)
self.assertEqual(5, i.length())
i = Interval(datetime.date(2018, 10, 31), length=datetime.timedelta(1))
self.assertEqual(datetime.date(2018, 10, 31), i.lo)
self.assertEqual(datetime.date(2018, 11, 1), i.hi)
self.assertEqual(datetime.timedelta(1), i.length())
# Non-integer zero length. The type of the zero must be
# preserved.
i = Interval(datetime.date(2018, 10, 31), length=datetime.timedelta(0))
self.assertEqual(datetime.date(2018, 10, 31), i.lo)
self.assertEqual(datetime.date(2018, 10, 31), i.hi)
self.assertEqual(datetime.timedelta(0), i.length())