def test_atanh():
a = atanh(interval(-0.5, 0.5))
assert a.start == np.arctanh(-0.5)
assert a.end == np.arctanh(0.5)
a = atanh(interval(0, 3))
assert a.is_valid is None
a = atanh(interval(-3, -2))
assert a.is_valid is False
a = atanh(0.5)
assert a.start == np.arctanh(0.5)
assert a.end == np.arctanh(0.5)
a = atanh(1.5)
assert a.is_valid is False
def test_atanh():
a = atanh(interval(-0.5, 0.5))
assert a.start == np.arctanh(-0.5)
assert a.end == np.arctanh(0.5)
a = atanh(interval(0, 3))
assert a.is_valid is None
a = atanh(interval(-3, -2))
assert a.is_valid is False
a = atanh(0.5)
assert a.start == np.arctanh(0.5)
assert a.end == np.arctanh(0.5)
a = atanh(1.5)
assert a.is_valid is False