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介绍将参数化作用域测试类的使用方法，所为作用于测试类，即作用于测试类中的所有方法，那么根据参数化在测试函数上的使用方式可知，这里必须要求测试类中的所有测试方法的形参必须是一致的，具体使用方法如下：
```python
import pytest
@pytest.mark.parametrize("n,expected", [(1, 2), (3, 4),(1,10])
class TestClass:
    def test_simple_case(self, n, expected):
        assert n + 1 == expected
    def test_weird_simple_case(self, n, expected):
        assert (n * 1) + 1 == expected
```
执行结果如下，可以看到当前测试类中有两个测试方法，参数化提供了三组数据，相当于是对每个测试方法都运用了三组数据，因此总共有6个测试用例，因为有一组数据对于这两个测试方法都是失败的，因此执行结果显示有4个通过，2个失败
```bash
(demo-HCIhX0Hq) E:\demo>pytest -s
=================== test session starts ===================
platform win32 -- Python 3.7.9, pytest-7.2.0, pluggy-1.0.0
rootdir: E:\demo
plugins: assume-2.4.3, rerunfailures-10.2
collected 6 items

test_demo.py ..F..F

======================== FAILURES =========================
____________ TestClass.test_simple_case[1-10] _____________

self = <demo.test_demo.TestClass object at 0x000001F3353A7C08>
n = 1, expected = 10

def test_simple_case(self, n, expected):
>       assert n + 1 == expected
E       assert (1 + 1) == 10

test_demo.py:5: AssertionError
_________ TestClass.test_weird_simple_case[1-10] __________

self = <demo.test_demo.TestClass object at 0x000001F33539FBC8>
n = 1, expected = 10

def test_weird_simple_case(self, n, expected):
>       assert (n * 1) + 1 == expected
E       assert ((1 * 1) + 1) == 10

test_demo.py:7: AssertionError
================= short test summary info =================
FAILED test_demo.py::TestClass::test_simple_case[1-10] - assert (1 + 1) == 10
FAILED test_demo.py::TestClass::test_weird_simple_case[1-10] - assert ((1 * 1) + 1) == 10
=============== 2 failed, 4 passed in 0.08s ===============

(demo-HCIhX0Hq) E:\demo>

```

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