`IS_RUNNING_TESTS` config should also detect Pytest runner

[paduszyk]

One may presume that pytest so popular that it is used with Django projects as often as the built-in manage.py test framework (usually including plugins, e.g. pytest-django). However, the IS_RUNNING_TESTS setting detects only the latter by default by looking for "test" in sys.argv.

Updating:

django-debug-toolbar/debug_toolbar/settings.py

Line 46 in cf71ded

"IS_RUNNING_TESTS": "test" in sys.argv,

by:

    "IS_RUNNING_TESTS": ("test" in sys.argv) or "PYTEST_VERSION" in os.environ,

NOTE: Using PYTEST_VERSION variable is a recommended way for determining whether pytest is running; see pytest-dev/pytest#9502 (comment).

[tim-schilling]

Thank you @paduszyk, I agree this is something we should do. For some reason, I thought we were already covering the pytest case, but I was wrong.