t1400: use test_must_be_empty

Use test_must_be_empty instead of reading the file and comparing its
contents to an empty string.  That's more efficient, as the function
only needs built-in meta-data only check in the usual case, and provides
nicer debug output otherwise.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 1fbd94040818ce818c4c7119ee3419620f9c16ff..ae8e2fcf3bf4f9358785a36f21e63b8967ddfc98 100755 (executable)
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -378,13 +378,13 @@ test_expect_success 'Query "master@{May 26 2005 23:32:00}" (exactly history star
        test_when_finished "rm -f o e" &&
        git rev-parse --verify "master@{May 26 2005 23:32:00}" >o 2>e &&
        test $C = $(cat o) &&
-       test "" = "$(cat e)"
+       test_must_be_empty e
 '
 test_expect_success 'Query "master@{May 26 2005 23:32:30}" (first non-creation change)' '
        test_when_finished "rm -f o e" &&
        git rev-parse --verify "master@{May 26 2005 23:32:30}" >o 2>e &&
        test $A = $(cat o) &&
-       test "" = "$(cat e)"
+       test_must_be_empty e
 '
 test_expect_success 'Query "master@{2005-05-26 23:33:01}" (middle of history with gap)' '
        test_when_finished "rm -f o e" &&
@@ -396,13 +396,13 @@ test_expect_success 'Query "master@{2005-05-26 23:38:00}" (middle of history)' '
        test_when_finished "rm -f o e" &&
        git rev-parse --verify "master@{2005-05-26 23:38:00}" >o 2>e &&
        test $Z = $(cat o) &&
-       test "" = "$(cat e)"
+       test_must_be_empty e
 '
 test_expect_success 'Query "master@{2005-05-26 23:43:00}" (exact end of history)' '
        test_when_finished "rm -f o e" &&
        git rev-parse --verify "master@{2005-05-26 23:43:00}" >o 2>e &&
        test $E = $(cat o) &&
-       test "" = "$(cat e)"
+       test_must_be_empty e
 '
 test_expect_success 'Query "master@{2005-05-28}" (past end of history)' '
        test_when_finished "rm -f o e" &&