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## 一、显示执行最慢的N个用例 
(1)在test_demo.py中编写10个测试函数
```python
import time
def test_demo01():
    time.sleep(0.1)
    assert 1==1

def test_demo02():
    time.sleep(0.2)
    assert 1==1

def test_demo03():
    time.sleep(0.3)
    assert 1==1

def test_demo04():
    time.sleep(0.4)
    assert 1==1

def test_demo05():
    time.sleep(0.5)
    assert 1==1

def test_demo06():
    time.sleep(0.6)
    assert 1==1

def test_demo07():
    time.sleep(0.7)
    assert 1==1

def test_demo08():
    time.sleep(0.8)
    assert 1==1

def test_demo09():
    time.sleep(0.9)
    assert 1==1

def test_demo10():
    time.sleep(1.0)
    assert 1==1

def test_demo11():
    assert 1==1
```
(2) 使用命令  pytest --durations=5 执行用来显示执行最慢的5个用例
```bash
$ pytest --durations=5
========================================================================= test session starts ==========================================================================
platform win32 -- Python 3.9.7, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: D:\src\blog\tests\demo02
plugins: allure-pytest-2.9.43, caterpillar-pytest-0.0.2, forked-1.3.0, rerunfailures-10.1, xdist-2.3.0
collected 11 items

test_demo01.py ...........                                                                                                                                        [100%]

========================================================================= slowest 5 durations ==========================================================================
1.00s call     test_demo01.py::test_demo10
0.92s call     test_demo01.py::test_demo09
0.81s call     test_demo01.py::test_demo08
0.71s call     test_demo01.py::test_demo07
0.60s call     test_demo01.py::test_demo06
========================================================================== 11 passed in 5.61s ==========================================================================
```
## 二、显示所有用例的执行时间 
(1)使用pytest --durations=0  即可显示所有用例的执行时间
```bash
$ pytest --durations=0
========================================================================= test session starts ==========================================================================
platform win32 -- Python 3.9.7, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: D:\src\blog\tests\demo02
plugins: allure-pytest-2.9.43, caterpillar-pytest-0.0.2, forked-1.3.0, rerunfailures-10.1, xdist-2.3.0
collected 11 items

test_demo01.py ...........                                                                                                                                        [100%]

(23 durations < 0.005s hidden.  Use -vv to show these durations.)
========================================================================== 11 passed in 5.63s ==========================================================================
```
(2)细心的发现上面并没有显示所有的，test_demo11用例没有显示，这是因为pytest默认显示的耗时大于0.005秒的用例，小于0.005秒的用例默认是不显示的，如果要显示耗时小于0.005秒的用例，需要加上 -vv的参数
```bash
$ pytest --durations=0 -vv
========================================================================= test session starts ==========================================================================
platform win32 -- Python 3.9.7, pytest-6.2.5, py-1.10.0, pluggy-1.0.0 -- D:\Python39\python.exe
cachedir: .pytest_cache
rootdir: D:\src\blog\tests\demo02
plugins: allure-pytest-2.9.43, caterpillar-pytest-0.0.2, forked-1.3.0, rerunfailures-10.1, xdist-2.3.0
collected 11 items

test_demo01.py::test_demo01 PASSED                                                                                                                                [  9%]
test_demo01.py::test_demo02 PASSED                                                                                                                                [ 18%]
test_demo01.py::test_demo03 PASSED                                                                                                                                [ 27%]
test_demo01.py::test_demo04 PASSED                                                                                                                                [ 36%]
test_demo01.py::test_demo05 PASSED                                                                                                                                [ 45%]
test_demo01.py::test_demo06 PASSED                                                                                                                                [ 54%]
test_demo01.py::test_demo07 PASSED                                                                                                                                [ 63%]
test_demo01.py::test_demo08 PASSED                                                                                                                                [ 72%]
test_demo01.py::test_demo09 PASSED                                                                                                                                [ 81%]
test_demo01.py::test_demo10 PASSED                                                                                                                                [ 90%]
test_demo01.py::test_demo11 PASSED                                                                                                                                [100%]

========================================================================== slowest durations ===========================================================================
1.01s call     test_demo01.py::test_demo10
0.91s call     test_demo01.py::test_demo09
0.81s call     test_demo01.py::test_demo08
0.71s call     test_demo01.py::test_demo07
0.60s call     test_demo01.py::test_demo06
0.51s call     test_demo01.py::test_demo05
0.40s call     test_demo01.py::test_demo04
0.30s call     test_demo01.py::test_demo03
0.21s call     test_demo01.py::test_demo02
0.11s call     test_demo01.py::test_demo01
0.00s setup    test_demo01.py::test_demo01
0.00s setup    test_demo01.py::test_demo06
0.00s setup    test_demo01.py::test_demo08
0.00s setup    test_demo01.py::test_demo10
0.00s teardown test_demo01.py::test_demo01
0.00s teardown test_demo01.py::test_demo11
0.00s setup    test_demo01.py::test_demo04
0.00s teardown test_demo01.py::test_demo02
0.00s teardown test_demo01.py::test_demo07
0.00s teardown test_demo01.py::test_demo10
0.00s teardown test_demo01.py::test_demo03
0.00s teardown test_demo01.py::test_demo04
0.00s teardown test_demo01.py::test_demo08
0.00s teardown test_demo01.py::test_demo06
0.00s setup    test_demo01.py::test_demo09
0.00s setup    test_demo01.py::test_demo02
0.00s teardown test_demo01.py::test_demo09
0.00s setup    test_demo01.py::test_demo05
0.00s setup    test_demo01.py::test_demo03
0.00s setup    test_demo01.py::test_demo07
0.00s setup    test_demo01.py::test_demo11
0.00s teardown test_demo01.py::test_demo05
0.00s call     test_demo01.py::test_demo11
========================================================================== 11 passed in 5.63s ==========================================================================
```
## 三、显示所有耗时大于t秒的用例 
(1)使用 pytest --durations=0 --durations-min=0.5 即可显示所有耗时大于0.5秒的用例
```bash
$ pytest --durations=0 --durations-min=0.5
========================================================================= test session starts ==========================================================================
platform win32 -- Python 3.9.7, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: D:\src\blog\tests\demo02
plugins: allure-pytest-2.9.43, caterpillar-pytest-0.0.2, forked-1.3.0, rerunfailures-10.1, xdist-2.3.0
collected 11 items

test_demo01.py ...........                                                                                                                                        [100%]

(27 durations < 0.5s hidden.  Use -vv to show these durations.)
========================================================================== 11 passed in 5.63s ==========================================================================

```

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