t/test-lib: add an SHA1 prerequisite

diff --git a/t/t1501-work-tree.sh b/t/t1501-work-tree.sh
index 02cf2013fc6f68cdb62739e9dff94fa08f5607be..9c0bc6525034021a1947d07faec84570d0dd629a 100755 (executable)
--- a/t/t1501-work-tree.sh
+++ b/t/t1501-work-tree.sh
@@ -431,4 +431,16 @@ test_expect_success 'error out gracefully on invalid $GIT_WORK_TREE' '
        )
 '
 
+test_expect_success 'refs work with relative gitdir and work tree' '
+       git init relative &&
+       git -C relative commit --allow-empty -m one &&
+       git -C relative commit --allow-empty -m two &&
+
+       GIT_DIR=relative/.git GIT_WORK_TREE=relative git reset HEAD^ &&
+
+       git -C relative log -1 --format=%s >actual &&
+       echo one >expect &&
+       test_cmp expect actual
+'
+
 test_done