netdev - [PATCH bpf-next 1/4] selftests/bpf: Print unexpected output on fail

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Date:   Wed, 14 Feb 2018 13:50:34 -0800
From:   Joe Stringer <joe@...d.net.nz>
To:     daniel@...earbox.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH bpf-next 1/4] selftests/bpf: Print unexpected output on fail

This makes it easier to debug off-hand when the error message isn't
exactly as expected.

Signed-off-by: Joe Stringer <joe@...d.net.nz>
---
 tools/testing/selftests/bpf/test_verifier.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index c0f16e93f9bd..6cf9bd6f08b7 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -11291,7 +11291,8 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 			goto fail_log;
 		}
 		if (!strstr(bpf_vlog, expected_err) && !reject_from_alignment) {
-			printf("FAIL\nUnexpected error message!\n");
+			printf("FAIL\nUnexpected error message!\n\tEXP: %s\n\tRES: %s\n",
+			      expected_err, bpf_vlog);
 			goto fail_log;
 		}
 	}
-- 
2.14.1