Re: [PATCH v2 2/2] test-lib: introduce required prereq for test runs

[Fabian Stelzer <fs@gigacodes.de>]

On 19.11.2021 12:13, Ævar Arnfjörð Bjarmason wrote:
>
>On Wed, Nov 17 2021, Fabian Stelzer wrote:
>
>> In certain environments or for specific test scenarios we might expect a
>> specific prerequisite check to succeed. Therefore we would like to
>> trigger an error when running our tests if this is not the case.
>
>trigger an error but...
>
>> To remedy this we add the environment variable GIT_TEST_REQUIRE_PREREQ
>> which can be set to a comma separated list of prereqs. If one of these
>> prereq tests fail then the whole test run will abort.
>
>..here it's "abort the whole test run". If that's what you want use
>BAIL_OUT, not error. See: 234383cd401 (test-lib.sh: use "Bail out!"
>syntax on bad SANITIZE=leak use, 2021-10-14)
>

Hm, while testing this change i noticed another problem that i really
have no idea how to fix.
When a test uses test_have_prereq then the error/BAIL_OUT message will only be printed
when run with '-v'. This is not the case when the prereq is specified
in the test header. The test run will abort, but no error will be
printed which can be quite confusing :/
I guess this has something to do with how tests are run in subshells and
their outputs only printed with -v. Maybe there should be some kind of
override for BAIL_OUT at least? Not sure if/how this could be done.