builtin/submodule--helper: factor out submodule updating

diff --git a/t/t4041-diff-submodule-option.sh b/t/t4041-diff-submodule-option.sh
index 058ee0829ded8163f99325494f326ef6609fee06..4e3499ef84c1bc3bb26857d70bf7f5ba78d5bf9a 100755 (executable)
--- a/t/t4041-diff-submodule-option.sh
+++ b/t/t4041-diff-submodule-option.sh
@@ -498,7 +498,7 @@ test_expect_success 'given commit --submodule=short' '
 test_expect_success 'setup .git file for sm2' '
        (cd sm2 &&
         REAL="$(pwd)/../.real" &&
-        mv .git "$REAL"
+        mv .git "$REAL" &&
         echo "gitdir: $REAL" >.git)
 '
 
@@ -527,7 +527,7 @@ test_expect_success 'diff --submodule with objects referenced by alternates' '
                git commit -m "sub a"
        ) &&
        (cd sub_alt &&
-               sha1_before=$(git rev-parse --short HEAD)
+               sha1_before=$(git rev-parse --short HEAD) &&
                echo b >b &&
                git add b &&
                git commit -m b &&