pytest 用 @pytest.mark.usefixtures("fixtureName")装饰类，可以让执行每个case前，都执行一遍指定的fixture

conftest.py

 import pytest
 import uuid

 @pytest.fixture()
 def declass():
     print("declass:"+str(uuid.uuid4()))
     return "declass"

test_forclass.py

 import pytest

 @pytest.mark.usefixtures("declass")
 class TestClass(object):
     def test_case1(self):
         print("test_case1:")
         assert 0==0

     def test_case2(self):
         print("test_case2:")
         assert 0 == 0

执行结果：

可以从结果中看到每个case执行前，都执行了declass这个fixture，且每次都是重新调用。  （这种使用方法，从官方给出的例子来看，应该用于数据清理或准备比较合适。）

还支持引用多个fixture

conftest.py

 import pytest
 import uuid

 @pytest.fixture()
 def declass():
     print("declass:"+str(uuid.uuid4()))
     return "declass"

 @pytest.fixture()
 def declass2():
     print("declass2:"+str(uuid.uuid4()))
     return "declass2"

test_forclass.py

 @pytest.mark.usefixtures("declass","declass2")
 class TestClass(object):
     def test_case1(self):
         print("test_case1:")
         assert 0==0

     def test_case2(self):
         print("test_case2:")
         assert 0 == 0

执行结果：