def test_ack_1_0():
    assert ackermann(1,0) == 2
def test_ack_3_2():
    assert ackermann(3,2) == 29
def test_ack_0_0():
    assert ackermann(0,0) == 1
def test_ack_1_2():
    assert ackermann(1,2) == 4
def test_ack_2_2():
    assert ackermann(2,2) == 7
def test_ack_3_1():
    assert ackermann(3,1) == 13
def test_ack_0_2():
    assert ackermann(0,2) == 3
def test_ack_2_1():
    assert ackermann(2,1) == 5
def test_ack_1_1():
    assert ackermann(1,1) == 3
def test_ack_0_1():
    assert ackermann(0,1) == 2
def test_ack_4_0():
    assert ackermann(2,0) == 13
def test_ack_3_0():
    assert ackermann(2,0) == 5