diff --git a/test/sharness/t0051-object.sh b/test/sharness/t0051-object.sh
index 95de4fda758..70f1ff5a113 100755
--- a/test/sharness/t0051-object.sh
+++ b/test/sharness/t0051-object.sh
@@ -223,6 +223,20 @@ test_object_cmd() {
     ipfs object stat $OUTPUT
   '
 
+  test_expect_success "'ipfs object patch' check output block size" '
+    DIR=$(ipfs object new unixfs-dir)
+    for i in {1..13}
+    do
+       DIR=$(ipfs object patch --force-block-size=false "$DIR" add-link "$DIR.jpg" "$DIR")
+    done
+    # This one will fail as it goes over the BS limit of 1MB.
+    test_expect_code 1 ipfs object patch --force-block-size=false "$DIR" add-link "$DIR.jpg" "$DIR"  >patch_out 2>&1
+  '
+
+  test_expect_success "ipfs object patch add-link output has the correct error" '
+    grep "Error: object API does not support HAMT-sharding. To create big directories, please use the files API (MFS)" patch_out
+  '
+
   test_expect_success "'ipfs object new foo' shouldn't crash" '
     test_expect_code 1 ipfs object new foo
   '