When a test wants to make sure there is no <string> in an output
file, we should just say "! grep string output"; "test_must_fail"
is there only to test Git command and catch unusual deaths we know
about (e.g. segv) as an error, not as an expected failure.

Signed-off-by: Junio C Hamano <gits...@pobox.com>
 t/README | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/t/README b/t/README
index e669bb3..35b3c5c 100644
--- a/t/README
+++ b/t/README
@@ -324,6 +324,9 @@ Don't:
    use 'test_must_fail git cmd'.  This will signal a failure if git
    dies in an unexpected way (e.g. segfault).
+   On the other hand, don't use test_must_fail for running regular
+   platform commands; just use '! cmd'.
  - use perl without spelling it as "$PERL_PATH". This is to help our
    friends on Windows where the platform Perl often adds CR before
    the end of line, and they bundle Git with a version of Perl that
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