Add an ID to each instance of behave

[JackHerRrer]

Context of the Pull Request

The system I want to test can only be accessed by a single entity at a time. Therefore, to conduct tests in parallel, I need to have as many instances of my system as there are instances of Behave. Additionally, each instance of Behave must access a unique instance of the system. Otherwise, the test results will be random.

A simple solution to this problem is to assign a different instance of the system to each instance of Behave. However, this implies knowing, from the Python code of the tests, in which instance of Behave we are currently located.

Currently, the only way (that I have found) to distinguish Behave processes is by looking at the output file used by the Behave instance (E.g behave.log, stdout1.txt, stdout2.txt, ...). Not only is this approach inelegant, but it is also unreliable. For example, when invoking BehaveX with 2 processes, in some cases, the output files will be stdout1.txt, stdout2.txt, and in other cases, the output files will be stdout2.txt, stdout3.txt.

Goal of the Pull Request

The purpose of this pull request is to assign an ID to each instance of Behave. The ID is unique and ranges from 0 to the number of processes -1.
The ID is passed to each Behave instance through the '-D' parameter of Behave.
This ID is then accessible in the context of each instance.
E.g

id = context.config.userdata['worker_id']

Thank you for this great project. If you have any questions, do not hesitate to ask for more details

[JackHerRrer]

Hello, is it possible to have a feedback ? Is there a chance of this pull request to be reviewed ? Or even be integreted ? and when ?

[hrcorval]

Hi @JackHerRrer, I have merged this code and it will be released as part of version 4.0.3: https://github.com/hrcorval/behavex/compare/release_4.0.3

Thanks a lot for your contribution!!