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Parametrize参数化同样支持对两组数据的全排列组合测试，这个功能对一些要求数据进行全排列覆盖测试的场景是非常有用的，具体用法如下，即使用两次参数化声明即可。
```python
import pytest

@pytest.mark.parametrize("x", [0, 1])
@pytest.mark.parametrize("y", [2, 3])
def test_foo(x, y):
    print("x:",x)
    print("y:",y)
assert x<y
```
执行结果如下，这里可以看出，x和y分别进行了全排列组合，即（0,2），（0,3），（1,2），（1,3），执行结果也明确显示这里有四个测试用例。
```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 4 items

test_demo.py x: 0
y: 2
.x: 1
y: 2
.x: 0
y: 3
.x: 1
y: 3
.

==================== 4 passed in 0.02s ====================

(demo-HCIhX0Hq) E:\demo>
```

那么加入一组数据是单个类型，另一组数据是多个，比如两个类型的，这两组数据放在一起进行全排列组合，具体使用方法见如下代码。
```python
import pytest

@pytest.mark.parametrize("x", [0, 1])
@pytest.mark.parametrize("y,z", [(2,3), (3,4)])
def test_foo(x, y,z):
    print("x:",x)
    print("y:",y)
    print("z:",z)
    assert x+y==z
```
执行结果如下，可以使用方式基本是类似的。
```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 4 items

test_demo.py x: 0
y: 2
z: 3
Fx: 1
y: 2
z: 3
.x: 0
y: 3
z: 4
Fx: 1
y: 3
z: 4
.

======================== FAILURES =========================
_____________________ test_foo[2-3-0] _____________________

x = 0, y = 2, z = 3

@pytest.mark.parametrize("x", [0, 1])
    @pytest.mark.parametrize("y,z", [(2,3), (3,4)])
    def test_foo(x, y,z):
        print("x:",x)
        print("y:",y)
        print("z:",z)
>       assert x+y==z
E       assert (0 + 2) == 3

test_demo.py:9: AssertionError
_____________________ test_foo[3-4-0] _____________________

x = 0, y = 3, z = 4

test_demo.py:9: AssertionError
================= short test summary info =================
FAILED test_demo.py::test_foo[2-3-0] - assert (0 + 2) == 3
FAILED test_demo.py::test_foo[3-4-0] - assert (0 + 3) == 4
=============== 2 failed, 2 passed in 0.08s ===============

(demo-HCIhX0Hq) E:\demo>
```

同理假如有三组数据需要进行全排列组合，有怎么操作的，类似地，只需要再增加一个个参数化的声明即可，如下。
```python
import pytest

@pytest.mark.parametrize("x", [0, 1])
@pytest.mark.parametrize("y", [2, 3])
@pytest.mark.parametrize("z", [4, 5])
def test_foo(x, y,z):
    print("x:",x)
    print("y:",y)
    print("z:",z)
    assert x+y==z
```
此时执行结果如下，可以发现，此时的组合个数为2*2*2=8个，因此总共有8个用例。
```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 8 items

test_demo.py x: 0
y: 2
z: 4
Fx: 1
y: 2
z: 4
Fx: 0
y: 3
z: 4
Fx: 1
y: 3
z: 4
.x: 0
y: 2
z: 5
Fx: 1
y: 2
z: 5
Fx: 0
y: 3
z: 5
Fx: 1
y: 3
z: 5
F

======================== FAILURES =========================
_____________________ test_foo[4-2-0] _____________________

x = 0, y = 2, z = 4

test_demo.py:10: AssertionError
_____________________ test_foo[4-2-1] _____________________

x = 1, y = 2, z = 4

test_demo.py:10: AssertionError
_____________________ test_foo[4-3-0] _____________________

x = 0, y = 3, z = 4

test_demo.py:10: AssertionError
_____________________ test_foo[5-2-0] _____________________

x = 0, y = 2, z = 5

test_demo.py:10: AssertionError
_____________________ test_foo[5-2-1] _____________________

x = 1, y = 2, z = 5

test_demo.py:10: AssertionError
_____________________ test_foo[5-3-0] _____________________

x = 0, y = 3, z = 5

test_demo.py:10: AssertionError
_____________________ test_foo[5-3-1] _____________________

x = 1, y = 3, z = 5

test_demo.py:10: AssertionError
================= short test summary info =================
FAILED test_demo.py::test_foo[4-2-0] - assert (0 + 2) == 4
FAILED test_demo.py::test_foo[4-2-1] - assert (1 + 2) == 4
FAILED test_demo.py::test_foo[4-3-0] - assert (0 + 3) == 4
FAILED test_demo.py::test_foo[5-2-0] - assert (0 + 2) == 5
FAILED test_demo.py::test_foo[5-2-1] - assert (1 + 2) == 5
FAILED test_demo.py::test_foo[5-3-0] - assert (0 + 3) == 5
FAILED test_demo.py::test_foo[5-3-1] - assert (1 + 3) == 5
=============== 7 failed, 1 passed in 0.13s ===============

(demo-HCIhX0Hq) E:\demo>
```

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