Getting started with pytest -- description of fixture parameters

fixture Implement pre post

Parameters

scope -- Scope   

        function： function / Methods are executed before and after

                             The manual call method is to add fixture The name of

        class： class After and before execution

                   The way to manually call is to add @pytest.mark.usefixtures(" Method name ") Decorator

        package/session： The whole project session After and before execution .

                         When session It only works on one .py File is equivalent to module

                         Generally, they will combine conftest.py File to implement

autouse -- Automatic execution

         Default ：False; If instead True, You don't need to call , In the corresponding scope, it will automatically execute

params -- Realize parameterization ( Data driven )

ids -- Parameters , It has to be with params Use it together , Alias the parameter

name -- to fixture names

yield Data can be returned , similar return, however return You can't connect code later , and yield Later, you can continue to write other code . So in “ After ” In operation , We are all used to yield.

When scope The value of is class,autouse The value of is False when , How to call fixture：

@pytest.mark.usefixtures(" Method name ")

 

 params   For parameterization

For example, a use case needs to be used separately 3 Different data （ Equivalence classes and boundary values ） To test , If a use case code is written three times, it's a little stupid , Use this time params This parameter can

explain ：

1、params=read_yaml() --params= Method name (), call

2、exe_sql(request)  Be careful , In brackets is request   That's what the regulations say , No why?

3、request.param   Call through read_yaml() Method to get the data , It is required to write like this , The above parameter is params, Here is param, It is required to write like this

4、exe_sql I used to print here print(request.param) Look at the , And then yield Of . To illustrate , Is to realize parameterization ( Data driven ), To emphasize directly, pass yield Method can pass the obtained value as a parameter to other methods

5、test_api() Method reference fixture, Pass in the method fixture Modified method name

Execution results ：

You can see , Use case 2 is executed three times with test data .

ids Not to be used alone , It has to be with params Use it together , The function is to alias the parameter

Look at the execution result above

If your data is too long , Then the display here will be messy , At this time, you can use ids This parameter

Execution results ：

name The function is to give fixture names

Up here we use fixture The method of decoration is exe_sql, If this method is long or you don't want to call it, call it by this name , You can use it name to fixture The method of modification is to change the name

Be careful ： When you give fixture Method of decoration (exe_sql()) Yes name After changing the name of the parameter , When calling use cases, you should use your changed name (db), Use the original method name (exe_sql) It's a mistake , Because I can't find it .

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