test: test_must_be_empty helper

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index fa62d010f68e3ee97e6754687ad4d08564d3c96b..a8e57f05c1efb2e5302709296fb4169a0fc86c78 100644 (file)
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -91,6 +91,10 @@ q_to_tab () {
        tr Q '\011'
 }
 
+qz_to_tab_space () {
+       tr QZ '\011\040'
+}
+
 append_cr () {
        sed -e 's/$/Q/' | tr Q '\015'
 }
@@ -602,6 +606,18 @@ test_cmp() {
        $GIT_TEST_CMP "$@"
 }
 
+# Check if the file expected to be empty is indeed empty, and barfs
+# otherwise.
+
+test_must_be_empty () {
+       if test -s "$1"
+       then
+               echo "'$1' is not empty, it contains:"
+               cat "$1"
+               return 1
+       fi
+}
+
 # Tests that its two parameters refer to the same revision
 test_cmp_rev () {
        git rev-parse --verify "$1" >expect.rev &&