嵌套参数化测试 (pytest)

Question

我正在尝试嵌套参数化测试。 下面的代码做到了，但我只想在param1更改时执行代码（“print param1”很耗时）

@pytest.mark.parametrize("param3", ["p31", "p32"])
@pytest.mark.parametrize("param2", ["p21", "p22"])
@pytest.mark.parametrize("param1", ["p11", "p12"])
def test_one(param1, param2, param3):
    print param1  # goal is to run this only when param1 changes
    print param2, param3

我试过这个，但它似乎不起作用：

@pytest.mark.parametrize("param1", ["p11", "p12"])
def test_one(param1, param2, param3):
   print param1  # goal is to run this only when param1 changes
   @pytest.mark.parametrize("param3", ["p31", "p32"])
   @pytest.mark.parametrize("param2", ["p21", "p22"])
   def test_two(param2, param3):
      print param2, param3

有人有想法吗？

Answer 1

一个同事给了我一个解决方案：

@pytest.fixture(scope="class", params=["B1","B2"])
def two(request):
   print "\n SETUP", request.param
   yield request.param
   #print "\n UNDO", request.param

@pytest.fixture(scope="class", params=["A1", "A2"])
def one(request):
   print "\n SETUP", request.param
   yield request.param
   #print "\n UNDO", request.param

class Test_myclass():
   @pytest.mark.parametrize("param4", ["D1", "D2"])
   @pytest.mark.parametrize("param3", ["C1", "C2"])
   def test_three(self, one, two, param3, param4):
      print "\n ({0} {1}) RUN ".format(one, two), param3, param4,

Answer 2

为了补充egabro 的答案，您可以使用"module" （或"session" ）范围来达到相同的目标，而不必将测试嵌套在类中：

import pytest

@pytest.fixture(scope="module", params=["B1","B2"])
def two(request):
   print("\n SETUP", request.param)
   return request.param
   #print "\n UNDO", request.param

@pytest.fixture(scope="module", params=["A1", "A2"])
def one(request):
   print("\n SETUP", request.param)
   return request.param
   #print "\n UNDO", request.param

@pytest.mark.parametrize("param4", ["D1", "D2"])
@pytest.mark.parametrize("param3", ["C1", "C2"])
def test_three(one, two, param3, param4):
  print("\n ({0} {1}) RUN ".format(one, two))

请参阅有关fixtures 的 pytest 文档。