Pytest framework implements pre post processing

One 、setup/teardown

By adding setup And teardown Method , Make the Each use case Both before and after .

Case code ：

class TestAA:
    def setup(self):
        print(' Start --------')

    @pytest.mark.smoke
    def testaa(self):
        time_loc=time.strftime('%H-%M-%S',time.localtime())
        time.sleep(2)
        print(time_loc+' Hello! bb ah ')

    @pytest.mark.run(order=1)   # Indicates in the execution order , The first 1 To execute 
    def testbb(self):
        time_loc=time.strftime('%H-%M-%S',time.localtime())
        print(time_loc+' Hello! aa ah ')
        
    def teardown(self):
        print(' end -----------------\n')

Running results ：

Two 、setup_class/teardown_class

stay Before all use cases Only once

Use scenarios ：
Initialization before and after each class execution , Such as ： establish / Destroy log object , establish / Destroy connection to database , establish / Destroy the request object of the interface .

Case code ：

class TestAA:
    def setup_class(self):
        print(' Before class execution ---')

	....................
	....................

 	def teardown_class(self):
        print(' After class execution ------')

Running results ：

3、 ... and 、 Use fixture Decorator to achieve part Pre post of use case

Format ：@pytest.fixture(scope=' ',params='',autouse='',ids='',name='')

---

（1）scope: It means being @pytest.fixture Method of marking （function, Default this value ）, class （class）, modular （module） Or bag （package/session）
（2）params: A parameterized （ Support List [ ], Tuples （）, Dictionary list [{},{}], Dictionary tuples （{},{},{}））
（3）autouse=True： Automatic use , The default value is False
（4）ids: When using params When parameterizing , Set a variable name for each value
（5）name: Show to be @pytest.fixture Take an alias for the marked function name

1. Pre post for each method
Code ：

@pytest.fixture(scope='function',autouse='true')
def my_fixture():
    print('fixture The pre - ')
    yield  # Indicates post 
    print('fixture The back of ')

class TestAA:
    @pytest.mark.smoke
    def testaa(self):
        time_loc=time.strftime('%H-%M-%S',time.localtime())
        time.sleep(2)
        print(time_loc+' Hello! bb ah ')
       ...............
       ...............

Running results ：

2. Pre and post a specified method
Code ：

@pytest.fixture(scope='function')
def my_fixture():
    print('fixture The pre - ')
    yield  # Indicates post 
    print('fixture The back of ')

class TestAA:
    @pytest.mark.smoke
    # This method is specified before and after 
    def testaa(self,my_fixture):
        time_loc=time.strftime('%H-%M-%S',time.localtime())
        time.sleep(2)
        print(time_loc+' Hello! bb ah ')
		...............
		...............

3. Realize parameterization

@pytest.fixture(scope='function',params=[' Liuganming ',' Oho ',' Donnie Yen '])
def my_fixture(request):
    return request.param  #(！！ Pay attention to this param  No, s)
	#(！！！return and yield They all mean to return , however return There must be no code behind the ,yield Code can be followed .)

class TestAA:
    @pytest.mark.smoke
    def testaa(self,my_fixture):
        time_loc=time.strftime('%H-%M-%S',time.localtime())
        time.sleep(2)
        print(time_loc+' Hello! bb ah ')
        print('.................'+str(my_fixture))

Running results ：

Four 、 adopt conftest.py Module and @pytest.fixture() Combined use to achieve overall situation Pre application of

1.conftest.py The file is a fixture configuration file stored separately , The name cannot be changed .
2. use : Can be in different py Use the same in the file fixture function .
3. One can be placed under different modules conftest.py The file implements the corresponding module pre post

5、 ... and 、parametrize The basic usage of decorators

@pytest.mark.parametrize(args_name,args_value)
args_name: Parameter name
args_value: Parameter values （ list , Tuples , Dictionary list , Dictionary tuples ）, How many use cases will be executed as many times

Example 1（ Single data ）:

class TestAA:
	@pytest.mark.parametrize('name',[' Xiao Ming ',' petty thief ',' Xiao Xiao '])
    def testdd(self,name):
        print(name)

result ：

Example 2（ More data ）：

class TestAA:
	@pytest.mark.parametrize('name,sex',[ [' Xiao Ming ',' male '],[' petty thief ',' Woman '],[' Xiao Xiao ',' manly woman '] ])
    def testdd(self,name,sex):
        print(name,sex)

result ：