def test_exp():
    a = exp(interval(-np.inf, 0))
    assert a.start == np.exp(-np.inf)
    assert a.end == np.exp(0)
    a = exp(interval(1, 2))
    assert a.start == np.exp(1)
    assert a.end == np.exp(2)
    a = exp(1)
    assert a.start == np.exp(1)
    assert a.end == np.exp(1)
def test_exp():
    a = exp(interval(-np.inf, 0))
    assert a.start == np.exp(-np.inf)
    assert a.end == np.exp(0)
    a = exp(interval(1, 2))
    assert a.start == np.exp(1)
    assert a.end == np.exp(2)
    a = exp(1)
    assert a.start == np.exp(1)
    assert a.end == np.exp(1)