print tags in gherkin-terminal-reporter

[guillego]

Hello, I am using the Gherkin tags in the feature specification to refer scenarios to different software requirements and it would be really convenient to be able to get those tags printed when I run pytest with the --gherkin-terminal-reporter option. I know they are generated into the cucumber JSON but that's less human readable as of right now.

The feature looks like this:

@R1.1 @R1.2
  Scenario: Send packages to socket
    Given a service listening on a random socket
    When tool sends "2" packages to socket
    Then "2" packages are received in the service

So it would be great to get the tags formatted in some way in the output of the test:

$ pytest --gherkin-terminal-reporter -vv
===================================================================================== test session starts =====================================================================================                                                                          

tests/pacsio_test.py::test_send_packages_to_socket <- utilities/pacs_io/.venv/lib/python3.8/site-packages/pytest_bdd/scenario.py 
Feature: Tool for network testing
    Scenario: Send packages to socket
    Given a service listening on a random socket
    When tool sends "2" packages to socket
    Then "2" packages are received in the service
    PASSED
    (tags: R1.1, R1.2)

[guillego]

I'm trying to implement it as a feature (first-time contributor to OSS), but I'm having trouble with the test, if I define a test-case for it like this in feature/test_gherkin_terminal_reporter.py:

FEATURE_WITH_TAGS = """\
@feature_tag0 @feature_tag1
Feature: Gherkin terminal output feature
    @scenario_tag0 @scenario_tag1
    Scenario: Scenario example 1
        Given there is a bar
        When the bar is accessed
        Then world explodes
"""

Then pytest throws this:

E pytest.PytestUnknownMarkWarning: Unknown pytest.mark.scenario_tag1 - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/mark.html

[guillego]

I can't find a contributing guideline but I have something that works in my forked branch (minus the testing, which I can't get to properly work). How does the PR process work?