Add TAP tests for backtrace functionality (was Re: Add test module for verifying backtrace functionality)

On Tue, Feb 20, 2024 at 11:30 AM Bharath Rupireddy
<bharath(dot)rupireddyforpostgres(at)gmail(dot)com> wrote:
>
> On Tue, Feb 13, 2024 at 2:11 AM Bharath Rupireddy
> <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> wrote:
> >
> > Hi,
> >
> > Postgres has a good amount of code for dealing with backtraces - two
> > GUCs backtrace_functions and backtrace_on_internal_error,
> > errbacktrace; all of which use core function set_backtrace from
> > elog.c. I've not seen this code being tested at all, see code coverage
> > report - https://coverage.postgresql.org/src/backend/utils/error/elog.c.gcov.html.
> >
> > I think adding a simple test module (containing no .c files) with only
> > TAP tests will help cover this code. I ended up having it as a
> > separate module under src/test/modules/test_backtrace as I was not
> > able to find an existing TAP file in src/test to add these tests. I'm
> > able to verify the backtrace related code with the attached patch
> > consistently. The TAP tests rely on the fact that the server emits
> > text "BACKTRACE: " to server logs before logging the backtrace, and
> > the backtrace contains the function name in which the error occurs.
> > I've turned off query statement logging (set log_statement = none,
> > log_min_error_statement = fatal) so that the tests get to see the
> > functions only in the backtrace. Although the CF bot is happy with the
> > attached patch https://github.com/BRupireddy2/postgres/tree/add_test_module_for_bcktrace_functionality_v1,
> > there might be some more flakiness to it.
> >
> > Thoughts?
>
> Ran pgperltidy on the new TAP test file added. Please see the attached v2 patch.

I've now moved the new TAP test file to src/test/modules/test_misc/t
as opposed to a new test module to keep it simple. I was not sure why
I hadn't done that in the first place.

--
Bharath Rupireddy
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com