[PATCH v3 2/5] serve tests: use test_cmp in "protocol violations" test

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Amend the protocol violations tests to check the full output, not just
grep it. This changes code added in 4845b772458 (upload-pack: handle
unexpected delim packets, 2020-03-27). The newly added test in the
preceding commit already did the full test_cmp.

I have a related series to tweak the output from upload-pack et al, we
really want to make sure we have this exact output, and not fewer or
more lines etc.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/t5704-protocol-violations.sh | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/t/t5704-protocol-violations.sh b/t/t5704-protocol-violations.sh
index 95f68e1d4b..038fffd3d0 100755
--- a/t/t5704-protocol-violations.sh
+++ b/t/t5704-protocol-violations.sh
@@ -14,9 +14,12 @@ test_expect_success 'extra delim packet in v2 ls-refs args' '
 		# protocol expects 0000 flush here
 		printf 0001
 	} >input &&
+	cat >err.expect <<-\EOF &&
+	fatal: expected flush after ls-refs arguments
+	EOF
 	test_must_fail env GIT_PROTOCOL=version=2 \
-		git upload-pack . <input 2>err &&
-	test_i18ngrep "expected flush after ls-refs arguments" err
+		git upload-pack . <input 2>err.actual &&
+	test_cmp err.expect err.actual
 '
 
 test_expect_success 'extra delim packet in v2 fetch args' '
@@ -27,9 +30,12 @@ test_expect_success 'extra delim packet in v2 fetch args' '
 		# protocol expects 0000 flush here
 		printf 0001
 	} >input &&
+	cat >err.expect <<-\EOF &&
+	fatal: expected flush after fetch arguments
+	EOF
 	test_must_fail env GIT_PROTOCOL=version=2 \
-		git upload-pack . <input 2>err &&
-	test_i18ngrep "expected flush after fetch arguments" err
+		git upload-pack . <input 2>err.actual &&
+	test_cmp err.expect err.actual
 '
 
 test_expect_success 'extra delim packet in v2 object-info args' '
-- 
2.32.0.788.ge724008458