Default to --capture=no when debugging pytest

[karthiknadig]

From the discussion on StackOverflow, this is due to microsoft/debugpy#899 (comment). So it seems that VSCode should default to --capture=no when debugging pytest.

Originally posted by @int19h in microsoft/debugpy#947 (comment)

[harupy]

@karthiknadig Can I work on this issue?

[karthiknadig]

@harupy go ahead.

[zljubisic]

I don't know why we need default to --capture=no, because if we set it in settings.json:

{
    "python.testing.pytestArgs": [
        "tests",
        "--no-cov",
        "--capture=no"
    ],
    "python.testing.unittestEnabled": false,
    "python.testing.pytestEnabled": true,
    "testing.defaultGutterClickAction": "debug"
}

even you can see it as a command option in sys.argv --capture=no is not used.

We could say the same for --no-cov because coverage steals tracing api (sys.settrace), so if we are debugging turn of the coverage.

[zljubisic]

How about --no-cov?

[eleanorjboyd]

started new issue for the --no-cov feature request here: #19985

[zljubisic]

Thanks