Use `test_must_be_be_empty <file>` instead of `test -z "$(cat <file>)"`.

Suggested-by: Fabian Ruch <baf...@gmail.com>
Signed-off-by: David Aguilar <dav...@gmail.com>
---
 t/t1503-rev-parse-verify.sh | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/t/t1503-rev-parse-verify.sh b/t/t1503-rev-parse-verify.sh
index ab9878d..9ac4627 100755
--- a/t/t1503-rev-parse-verify.sh
+++ b/t/t1503-rev-parse-verify.sh
@@ -72,22 +72,22 @@ test_expect_success 'fails with any bad rev or many good 
revs' '
 
 test_expect_success 'fails silently when using -q' '
        test_must_fail git rev-parse --verify --quiet 2>error &&
-       test -z "$(cat error)" &&
+       test_must_be_empty error &&
        test_must_fail git rev-parse -q --verify foo 2>error &&
-       test -z "$(cat error)" &&
+       test_must_be_empty error &&
        test_must_fail git rev-parse --verify -q HEAD bar 2>error &&
-       test -z "$(cat error)" &&
+       test_must_be_empty error &&
        test_must_fail git rev-parse --quiet --verify baz HEAD 2>error &&
-       test -z "$(cat error)" &&
+       test_must_be_empty error &&
        test_must_fail git rev-parse -q --verify $HASH2 HEAD 2>error &&
-       test -z "$(cat error)"
+       test_must_be_empty error
 '
 
 test_expect_success 'fails silently when using -q with deleted reflogs' '
        git branch test &&
        git reflog delete --updateref --rewrite test@{0} &&
        test_must_fail git rev-parse -q --verify test@{0} >error 2>&1 &&
-       test -z "$(cat error)"
+       test_must_be_empty error
 '
 
 test_expect_success 'no stdout output on error' '
-- 
2.1.0.30.g05c535b.dirty

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