def test_interval_invalid_issubset():
class Impossible:
def __init__(self):
self.left = -1
self.right = float("nan")
def is_empty(self):
return False
interval = Interval(0, 1)
other = Impossible()
with pytest.raises(RuntimeError) as excinfo:
interval.issubset(other)
assert "XX" not in str(excinfo)
def test_impossible_issubset():
class Impossible:
def __init__(self):
self.left = -1
self.right = float("nan")
def is_empty(self):
return False
interval = Interval(0, 1)
other = Impossible()
with pytest.raises(RuntimeError) as exinfo:
interval.issubset(other)
msg = "issubset is only defined on Interval and IntervalUnion, but"
assert str(exinfo.value).startswith(msg)
def test_interval_issubset_interval_union():
"""
* Neither of both is empty.
* i2 is a subset of i1
* i2 is an intervalUnion
"""
i1 = Interval(6, 7)
i2 = IntervalUnion([[2, 3], [5, 7]])
assert i1.issubset(i2)
def test_interval_union_issubset_not():
iu = IntervalUnion([[0, 10], [20, 30], [40, 50]])
interval = Interval(12, 14)
assert not iu.issubset(interval)
assert not interval.issubset(iu)