t0000 failed

> Running t0000 with GIT_TEST_FAIL_PREREQS=true is failing.
> 
> > GIT_TEST_FAIL_PREREQS=true ./t0000-basic.sh
> t/./t0000-basic.sh:836: error: not ok 45 - lazy prereqs do not turn off tracing
> #
> #               run_sub_test_lib_test lazy-prereq-and-tracing
>  'lazy prereqs and -x' -v -x <<-\EOF &&
> #               test_lazy_prereq LAZY true
> #
> #               test_expect_success lazy 'test_have_prereq LAZY && echo trace'
> #
> #               test_done
> #               EOF
> #
> #               grep 'echo trace' lazy-prereq-and-tracing/err

> On Tue, Apr 28, 2020 at 08:52:34AM +0200, Son Luong Ngoc wrote:
>
> > Running t0000 with GIT_TEST_FAIL_PREREQS=true is failing.
> >
> > > GIT_TEST_FAIL_PREREQS=true ./t0000-basic.sh
> > t/./t0000-basic.sh:836: error: not ok 45 - lazy prereqs do not turn off tracing
> > #
> > #               run_sub_test_lib_test lazy-prereq-and-tracing
> >  'lazy prereqs and -x' -v -x <<-\EOF &&
> > #               test_lazy_prereq LAZY true
> > #
> > #               test_expect_success lazy 'test_have_prereq LAZY && echo trace'
> > #
> > #               test_done
> > #               EOF
> > #
> > #               grep 'echo trace' lazy-prereq-and-tracing/err
>
> I think the patch below is the right fix.
>
> -- >8 --
> Subject: [PATCH] t0000: disable GIT_TEST_FAIL_PREREQS in sub-tests
>
> The test added by 477dcaddb6 (tests: do not let lazy prereqs inside
> `test_expect_*` turn off tracing, 2020-03-26) runs a sub-test script
> that traces a test with a lazy prereq, like:
>
>   test_have_prereq LAZY && echo trace
>
> That won't work if GIT_TEST_FAIL_PREREQS is set in the environment,
> because our have_prereq will report failure, and we won't run the echo
> at all.
>
> We could work around this by avoiding the &&-chain, but we can
> fix this and any future tests at once by unsetting that variable for our
> sub-tests. These are meant to be controlled environments where we test
> the test-suite itself; the outer test snippet should be in charge of the
> sub-test environment, not whatever mode the user happens to be running
> in.

>
> Reported-by: Son Luong Ngoc <sluongng@gmail.com>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  t/t0000-basic.sh | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
> index b859721620..f58f3deaa8 100755
> --- a/t/t0000-basic.sh
> +++ b/t/t0000-basic.sh
> @@ -98,6 +98,7 @@ _run_sub_test_lib_test_common () {
>  		export TEST_DIRECTORY &&
>  		TEST_OUTPUT_DIRECTORY=$(pwd) &&
>  		export TEST_OUTPUT_DIRECTORY &&
> +		sane_unset GIT_TEST_FAIL_PREREQS &&
>  		if test -z "$neg"
>  		then
>  			./"$name.sh" "$@" >out 2>err
> --
> 2.26.2.827.g3c1233342b
>
>