fix bsd shell negation

diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index cbbfa9cb4986403cb214bba6c2216c85471469c9..c0973b4e6ee2c6a55d1573e2341607c4adfcbb10 100755 (executable)
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -81,7 +81,7 @@ test_expect_success 'Show all headers' '
                -e "s/^\(Message-Id:\).*/\1 MESSAGE-ID-STRING/" \
                -e "s/^\(X-Mailer:\).*/\1 X-MAILER-STRING/" \
                >actual-show-all-headers &&
-       diff -u expected-show-all-headers actual-show-all-headers
+       test_cmp expected-show-all-headers actual-show-all-headers
 '
 
 z8=zzzzzzzz