def test_inc_one():
b = Book.find_by_title('油层物理')
b.increase_one()
def test_inc():
b = Book.find_by_title('渗流力学')
b.increase(10)
def test_dec():
b = Book.find_by_title('油层物理')
b.decrease(1)
def test_dec_one():
b = Book.find_by_title('油层物理')
b.decrease_one()
