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[TOC]

### 1 默认情况下，所有用例都会执行完成
测试脚本代码如下：

```python
def test_1():
    print("in test_1")
    assert 1==1

def test_2():
    print("in test_2")
    assert 1==2

def test_3():
    print("in test_3")
    assert 1==1

def test_4():
    print("in test_4")
    assert 1==2
```
使用pytest 命令执行结果如下：即，四个用例全部执行

```python
G:\redrose2100\src\demo>pytest
========================================================================== test session starts ===========================================================================
platform win32 -- Python 3.9.5, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: G:\redrose2100\src\demo
plugins: rerunfailures-10.0
collected 4 items

test_example.py .F.F                                                                                                                                                [100%]

================================================================================ FAILURES ================================================================================
_________________________________________________________________________________ test_2 _________________________________________________________________________________

def test_2():
        print("in test_2")
>       assert 1==2
E       assert 1 == 2

test_example.py:8: AssertionError
-------------------------------------------------------------------------- Captured stdout call --------------------------------------------------------------------------
in test_2
_________________________________________________________________________________ test_4 _________________________________________________________________________________

def test_4():
        print("in test_4")
>       assert 1==2
E       assert 1 == 2

test_example.py:16: AssertionError
-------------------------------------------------------------------------- Captured stdout call --------------------------------------------------------------------------
in test_4
======================================================================== short test summary info =========================================================================
FAILED test_example.py::test_2 - assert 1 == 2
FAILED test_example.py::test_4 - assert 1 == 2
====================================================================== 2 failed, 2 passed in 0.13s =======================================================================

G:\redrose2100\src\demo>
```
* 当希望在有用例失败的情况下，即停止执行后续其他用例，使用 pytest -x即可
如下，使用 pytest -x 执行的结果，即执行到第二个用例是断言错误，因此停止不在执行后续的两个用例

```python
G:\redrose2100\src\demo>pytest -x
========================================================================== test session starts ===========================================================================
platform win32 -- Python 3.9.5, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: G:\redrose2100\src\demo
plugins: rerunfailures-10.0
collected 4 items

test_example.py .F

def test_2():
        print("in test_2")
>       assert 1==2
E       assert 1 == 2

test_example.py:8: AssertionError
-------------------------------------------------------------------------- Captured stdout call --------------------------------------------------------------------------
in test_2
======================================================================== short test summary info =========================================================================
FAILED test_example.py::test_2 - assert 1 == 2
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
====================================================================== 1 failed, 1 passed in 0.12s =======================================================================

G:\redrose2100\src\demo>
```
### 2 通过 pytest --maxfail 可以控制做多失败几次，即停止运行
用例内容再增加两个，如下：

```python
def test_1():
    print("in test_1")
    assert 1==1

def test_2():
    print("in test_2")
    assert 1==2

def test_3():
    print("in test_3")
    assert 1==1

def test_4():
    print("in test_4")
    assert 1==2

def test_5():
    print("in test_5")
    assert 1==1

def test_6():
    print("in test_4")
    assert 1==2
```
使用 pytest --maxfail 2 即最多遇到两次失败用例，则停止执行后面其他用例，此场景主要用于比如当环境等因素出现异常时，可以设置比如正常情况下几乎所有用例均没有问题，但是当出现比如N次用例失败时，基本可以说明当前环境有问题了，此种情景下，此参数就很有用了

```python
G:\redrose2100\src\demo>pytest --maxfail 2
========================================================================== test session starts ===========================================================================
platform win32 -- Python 3.9.5, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: G:\redrose2100\src\demo
plugins: rerunfailures-10.0
collected 6 items

test_example.py .F.F

def test_2():
        print("in test_2")
>       assert 1==2
E       assert 1 == 2

test_example.py:8: AssertionError
-------------------------------------------------------------------------- Captured stdout call --------------------------------------------------------------------------
in test_2
_________________________________________________________________________________ test_4 _________________________________________________________________________________

def test_4():
        print("in test_4")
>       assert 1==2
E       assert 1 == 2

test_example.py:16: AssertionError
-------------------------------------------------------------------------- Captured stdout call --------------------------------------------------------------------------
in test_4
======================================================================== short test summary info =========================================================================
FAILED test_example.py::test_2 - assert 1 == 2
FAILED test_example.py::test_4 - assert 1 == 2
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 2 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
====================================================================== 2 failed, 2 passed in 0.14s =======================================================================

G:\redrose2100\src\demo>
```

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