Getting started with pytest ----- test case rules

One 、pytest Test case rules

1. Module name must be test_ Beginning or _test ending

2. The test class must be Test Start and cannot have init Method

3.  The test method must be test start

Two 、pytest Test case operation mode

1、 Main function mode
   a)  Run all ：pytest.main()

   b)  Specify modules / Catalog ：pytest.main(['-s', ' Specify the module name .py'])【 notes ： If the specified module is package Package all the files , Then pass on package The path is just 】

    c) adopt nodeid Specify the use case run ：nodeid By module name 、 Separator 、 Class name 、 Method name 、 The function name consists of . for example ：

pytest.main(['-s', ' route / Specify the module name .py:: Class name :: Method name '])

2、 Command line mode
    a) Run all ：pytest

    b) Specify modules / Catalog ：pytest -s Specify the module name .py【 notes ： If the specified module is package Package all the files , Then pass on package The path is just 】

3、 Read pytest.ini The configuration file 【** In practice, we need be used , above all **】

pytest.ini This file is pytest Configuration file of unit test framework .

1. Location ： It is usually placed in the project root directory , And the name cannot be changed

2. code ： Must be ANSI, It can be used notepad++ Modify encoding format

3. effect ： You can change pytest The default behavior （ For example, you don't want to use cases with test start , Then come here to change ）

4. Operation rules ： Whether running in main function or command line mode , Will read the configuration file .

5. How to write it ：

     New at root pytest.ini file

【 notes ： So that you can understand , It is suggested to delete the Chinese notes when using 】

If you prompt

Coding error . Can pass notepad++ Open this file , Then modify the code to ANSI（ It is suggested to delete the Chinese Notes ）

3、 ... and 、 Parameters, （ To list list Mode reference ）

• -s The output case debugging information includes print The content of

• -v In addition to outputting debugging information , It also displays the class name, use case method name

• -vs-v and -s Come together

• -n Support multithreading or distributed operation ; example ：

  pytest.main(['-vs', 'testcase/', '-n=2'])

  or

  pytest -vs ./testcase -n 2

• --reruns Run again after failure , Need to install pytest-rerunfailures library , grammar ：pytest.main(['-vs', 'testcase/', '--reruns=2']) When case execution fails , Will repeat 2 Time .

• -x As long as there is an error in one use case , Then the use case stops . grammar ：

  pytest.main(['-vs', 'testcase/', '-x'])

• --maxfail Stop after reporting an error at most . above -x If it is an error, stop , This is the maximum number of use case errors that can be accepted . grammar ：--maxfail=2

• -k Specify the test case according to the partial string of the test case . grammar ：

  pytest.main(['-vs', 'testcase/', '-k', ' Characters in the use case name '])

3、 ... and 、pytest The order in which test cases are executed

unittest： according to ASCII To determine the execution order

pytest： Default from top to bottom . If you don't want to perform from top to bottom , Can be marked ：

@pytest.mark.run(order=n)

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