create new dist option 'loadgroup'

[dohyeop-sub]

Intro

There are currently several options for distributing tests,
but there is still no suitable option for the following cases:

Case 1

In this case, it is efficient to divide all tests into different sessions.

@pytest.mark.parametrize('param', [A, B, C, D])
def test_something_heavy(param):
    do_something_heavy_test

Case 2

In this case, it is efficient to run all tests in the same session.

def test_something_light_1(heavy_fixture_cannot_filelock):
    do_something_light_test

def test_something_light_2(heavy_fixture_cannot_filelock):
    do_something_light_test

def test_something_light_3(heavy_fixture_cannot_filelock):
    do_something_light_test

Limit

If you use the loadscope option, all tests in Case 1 are performed in same session,
If the load option is used, all tests of Case 2 may be performed in different sessions.

Suggestion

Use the following xgroup mark and specify the name through the parameter.
Then, tests with the same name are executed in the same session.

@pytest.mark.xgroup(name="same_session")
def test_something_light_1(heavy_fixture_cannot_filelock):
    do_something_light_test

@pytest.mark.xgroup(name="same_session")
def test_something_light_2(heavy_fixture_cannot_filelock):
    do_something_light_test

@pytest.mark.xgroup(name="same_session")
def test_something_light_3(heavy_fixture_cannot_filelock):
    do_something_light_test

Comment

This PR is to make sure that the addition of a feature does not conflict with other features,
If you are okay with adding features, related tests will be implemented.

[nicoddemus]

Hi @dohyeop-sub,

Sorry seems I have missed this PR completely!

The feature is certainly interesting, and the PR seems actually near complete; you mention "If you are okay with adding features, related tests will be implemented", but seems like tests have been added already.

Would you like to finish it up?

[dohyeop-sub]

Hi @dohyeop-sub,

Sorry seems I have missed this PR completely!

The feature is certainly interesting, and the PR seems actually near complete; you mention "If you are okay with adding features, related tests will be implemented", but seems like tests have been added already.

Would you like to finish it up?

I'll finish it. I will be using a different account, so I will post a new PR with that account.

[dohyeop-sub]

Hi @nicoddemus, I created a new PR. #733.
Thank you.

[nicoddemus]

Closing in favor of #733.