apply: add t4137 for submodule updates

diff --git a/t/t2004-checkout-cache-temp.sh b/t/t2004-checkout-cache-temp.sh
index 0f4b2896af8b73edcd5bd60631405a430803a40f..f171a5578b6b81e4d7cb03ef0b6b9272ef610ffc 100755 (executable)
--- a/t/t2004-checkout-cache-temp.sh
+++ b/t/t2004-checkout-cache-temp.sh
@@ -194,11 +194,10 @@ test_expect_success \
  test $(cat ../$s1) = tree1asubdir/path5)
 )'
 
-test_expect_success SYMLINKS \
+test_expect_success \
 'checkout --temp symlink' '
 rm -f path* .merge_* out .git/index &&
-ln -s b a &&
-git update-index --add a &&
+test_ln_s_add b a &&
 t4=$(git write-tree) &&
 rm -f .git/index &&
 git read-tree $t4 &&