diff --git a/test/unit_tests/rest/utils.py b/test/unit_tests/rest/utils.py
index 79aeadf..ce24fb6 100644
--- a/test/unit_tests/rest/utils.py
+++ b/test/unit_tests/rest/utils.py
@@ -1,3 +1,4 @@
+import pytest
 from funcy import compose, lzip
 
 from pyinfra.server.packer.packers.identity import bundle
@@ -6,16 +7,19 @@ from pyinfra.utils.func import lstarlift
 from test.utils.server import bytes_to_string
 
 
+@pytest.mark.parametrize("n_items", [0, 2])
 def test_pack(input_data_items, metadata):
     assert lstarlift(pack)(zip(input_data_items, metadata)) == [
         {"data": bytes_to_string(d), "metadata": md} for d, md in zip(input_data_items, metadata)
     ]
 
 
+@pytest.mark.parametrize("n_items", [0, 2])
 def test_pack_unpack(input_data_items, metadata):
     assert lstarlift(compose(unpack, pack))(zip(input_data_items, metadata)) == lzip(input_data_items, metadata)
 
 
+@pytest.mark.parametrize("n_items", [0, 2])
 def test_bundle(input_data_items, metadata):
     assert lstarlift(bundle)(zip(input_data_items, metadata)) == [
         {"data": d, "metadata": md} for d, md in zip(input_data_items, metadata)