[PATCH v3 1/3] t0021: avoid grepping for a Perl-specific string at filter output

[Matheus Tavares <matheus.bernardino@usp.br>]

This test sets the t0021/rot13-filter.pl script as a long-running
process filter for a git checkout command. It then expects the filter to
fail producing a specific error message at stderr. In the following
commits we are going to replace the script with a C test-tool helper,
but the test currently expects the error message in a Perl-specific
format. That is, when you call `die <msg>` in Perl, it emits
"<msg> at - line 1." In preparation for the conversion, let's avoid the
Perl-specific part and only grep for <msg> itself.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
---
 t/t0021-conversion.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index 1c840348bd..963b66e08c 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -735,7 +735,7 @@ test_expect_success PERL 'process filter should restart after unexpected write f
 		rm -f debug.log &&
 		git checkout --quiet --no-progress . 2>git-stderr.log &&
 
-		grep "smudge write error at" git-stderr.log &&
+		grep "smudge write error" git-stderr.log &&
 		test_i18ngrep "error: external filter" git-stderr.log &&
 
 		cat >expected.log <<-EOF &&
-- 
2.37.1