def test_sqrt():
a = sqrt(interval(1, 4))
assert a.start == 1
assert a.end == 2
a = sqrt(interval(0.01, 1))
assert a.start == np.sqrt(0.01)
assert a.end == 1
a = sqrt(interval(-1, 1))
assert a.is_valid is None
a = sqrt(interval(-3, -1))
assert a.is_valid is False
a = sqrt(4)
assert (a == interval(2, 2)) == (True, True)
a = sqrt(-3)
assert a.is_valid is False
def test_sqrt():
a = sqrt(interval(1, 4))
assert a.start == 1
assert a.end == 2
a = sqrt(interval(0.01, 1))
assert a.start == np.sqrt(0.01)
assert a.end == 1
a = sqrt(interval(-1, 1))
assert a.is_valid is None
a = sqrt(interval(-3, -1))
assert a.is_valid is False
a = sqrt(4)
assert (a == interval(2, 2)) == (True, True)
a = sqrt(-3)
assert a.is_valid is False