test-lib: allow setting the index format version

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index aeae3ca7699b4c828f8ebe50624b5179fb5098b8..0bf1e63ab5021349ae0b625e2ea3daf80b6d80b6 100644 (file)
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -32,6 +32,11 @@ test_set_editor () {
        export EDITOR
 }
 
+test_set_index_version () {
+    GIT_INDEX_VERSION="$1"
+    export GIT_INDEX_VERSION
+}
+
 test_decode_color () {
        awk '
                function name(n) {