Return value for --last-failed-no-failures none

[dimaqq]

More of a question / maybe behaviour change request:

> rm -rf .pytest_cache/
> pytest --last-failed --last-failed-no-failures none && echo OK || echo FAIL
...
run-last-failure: no previously failed tests, deselecting all items.
=== test session starts ===
...
=== 1915 deselected, 12 warnings in 1.69s ===
FAIL

Should pytest return 0, truthy to shell when no tests are ran as a result of --last-failed-no-failures none ?

[Zac-HD]

See #2393 - failing (exit code 5) when no tests are run is the intended behaviour, to avoid 'missed alarms' where tests should fail but were not collected. We considered adding an option to disable this, but concluded that the complexity was better left to the invoking user or script - pytest has a lot of options already!