git_dir holds pointers to local strings, hence MUST be const.

diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 04fab26621af3aee3a44913ab290a4893b4f23ca..ddc80bbeae7703b8c4a2ddcf12d8b1ec9c6bbe46 100755 (executable)
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -14,6 +14,8 @@ D=4444444444444444444444444444444444444444
 E=5555555555555555555555555555555555555555
 F=6666666666666666666666666666666666666666
 m=refs/heads/master
+n_dir=refs/heads/gu
+n=$n_dir/fixes
 
 test_expect_success \
        "create $m" \
@@ -25,6 +27,16 @@ test_expect_success \
         test $B = $(cat .git/$m)'
 rm -f .git/$m
 
+test_expect_success \
+       "fail to create $n" \
+       'touch .git/$n_dir
+        git-update-ref $n $A >out 2>err
+        test $? = 1 &&
+        test "" = "$(cat out)" &&
+        grep "error: unable to resolve reference" err &&
+        grep $n err'
+rm -f .git/$n_dir out err
+
 test_expect_success \
        "create $m (by HEAD)" \
        'git-update-ref HEAD $A &&