Re: [PATCH 3/3] selftests: silence test output by default

[Shuah Khan]

On 09/18/2017 11:52 AM, Josef Bacik wrote:
> On Mon, Sep 18, 2017 at 11:46:18AM -0600, Shuah Khan wrote:
>> On 09/18/2017 11:37 AM, josef@xxxxxxxxxxxxxx wrote:
>>> From: Josef Bacik <jbacik@xxxxxx>
>>>
>>> Some of the networking tests are very noisy and make it impossible to
>>> see if we actually passed the tests as they run.  Default to suppressing
>>> the output from any tests run in order to make it easier to track what
>>> failed.
>>>
>>> Signed-off-by: Josef Bacik <jbacik@xxxxxx>
>>> --
>>
>> This change suppresses pass/fail wrapper output for all tests, not just the
>> networking tests.
>>
>> Could you please send me before and after results for what you are trying
>> to fix.
>>
> 
> Yeah I wanted to suppress extraneous output from everybody, I just happened to
> notice it because I was testing net.  The default thing already spits out what
> it's running and pass/fail, there's no need to include all of the random output
> unless the user wants to go and run the test manually.  As it is now it's
> _impossible_ to tell what ran and what passed/failed because of all the random
> output.

Unfortunately kselftests have lots of users that want different things. A recent
request is to use TAP13 format for output for external parsers to be able to parse.
That is what this change to add TAP13 header does.

The output you are seeing is the TAP 13 format to indicate the test has passed.

The right fix would be to suppress the Pass/Fail from the individual shell script
and have the shell script exit with error code. kselftest lib.mk will handle the
error code and print out pass/fail like it is doing now.

Using the common logic will help avoid duplicate code in tests/test scripts and
also makes the pass/fail messages consistent.

In the following output the individual test output can be eliminated since lib.mk
run_tests does that for you. In addition, you will also get a count of tests at
the end of the run of all tests in a test directory.

TAP version 13
selftests: run_netsocktests
========================================
--------------------
running socket test
--------------------
[PASS]
ok 1..1 selftests: run_netsocktests [PASS]
selftests: run_afpackettests
========================================
must be run as root
ok 1..2 selftests: run_afpackettests [PASS]
selftests: test_bpf.sh
========================================
test_bpf: [FAIL]
not ok 1..3 selftests:  test_bpf.sh [FAIL]
selftests: netdevice.sh
========================================
SKIP: Need root privileges
ok 1..4 selftests: netdevice.sh [PASS]

If you eliminate that you will just see the common lib.mk results.

TAP version 13
selftests: run_netsocktests
========================================
ok 1..1 selftests: run_netsocktests [PASS]
selftests: run_afpackettests
========================================
must be run as root
ok 1..2 selftests: run_afpackettests [PASS]
========================================
selftests: test_bpf.sh
========================================
not ok 1..3 selftests:  test_bpf.sh [FAIL]
selftests: netdevice.sh
========================================
SKIP: Need root privileges
ok 1..4 selftests: netdevice.sh [PASS]


If you would like to fix the duplicate output, please send me patches
to remove pass/fail output strings from tests instead. It is on my
todo to do that this release.


thanks,
-- Shuah