Precautions for triggering pytest.main() from other files

demand ： When starting the test , Not directly pytest xxx, But there is a separate py File where call pytest.main(), In this way, you can perform some required operations at the beginning , Of course, these operations are placed in pyest Various setup You can also do so. , However, there is a need to read some environment changes, but the external finally decided not to pass through environment variables but in the form of parameters for various reasons （ As for why we can't pass through the environment, it's not within the scope of this article , Nor is it the focus of this article ）.

If you start pytest The code for is as follows ( A simple example , Don't worry about code style to be brief , This is just to illustrate the problem )

import pytest
import sys

if __name__ == '__main__':
    print("env arg")
    print(sys.argv)
    print(sys.argv[1])

    pytest.main()

Input parameters

python pytest_main.py -envType=dev
env arg
['pytest_main.py', '-envType=dev']
-envType=dev
ERROR: usage: pytest_main.py [options] [file_or_dir] [file_or_dir] [...]
pytest_main.py: error: unrecognized arguments: -envType=dev
  inifile: /Users/xxx/PycharmProjects/celldbtest/pytest.ini
  rootdir: /Users/xxx/PycharmProjects/celldbtest

You can find here -envType=dev It was taken as pytest The parameters of , And perform python pytest_main.py -c pytest.ini Yes. .

terms of settlement ：
Because we actually tested the relevant configuration parameters in pytest.ini in , So we just need pytest.main() Specifies the file to read , He ignores the rest of the parameters

import pytest
import sys

if __name__ == '__main__':
    print("env arg")
    print(sys.argv)
    print(sys.argv[1])

    pytest.main(['-c', 'pytest.ini'])

At this time, the output of additional parameters at startup is pytest.main([‘-c’, ‘pytest.ini’]) Before processing , And these parameters will not be passed to pytest.main
python pytest_main.py -envType=dev -arg=val2