diff --git a/tests/functional/compression-levels.sh b/tests/functional/compression-levels.sh
deleted file mode 100644
index 85f12974a..000000000
--- a/tests/functional/compression-levels.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-source common.sh
-
-clearStore
-clearCache
-
-outPath=$(nix-build dependencies.nix --no-out-link)
-
-cacheURI="file://$cacheDir?compression=xz&compression-level=0"
-
-nix copy --to $cacheURI $outPath
-
-FILESIZES=$(cat ${cacheDir}/*.narinfo | awk '/FileSize: /{sum+=$2}END{print sum}')
-
-clearCache
-
-cacheURI="file://$cacheDir?compression=xz&compression-level=5"
-
-nix copy --to $cacheURI $outPath
-
-FILESIZES2=$(cat ${cacheDir}/*.narinfo | awk '/FileSize: /{sum+=$2}END{print sum}')
-
-[[ $FILESIZES -gt $FILESIZES2 ]]
diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index 53fd22560..2b8e46bd4 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -117,7 +117,6 @@ functional_tests_scripts = [
   'shell.sh',
   'brotli.sh',
   'zstd.sh',
-  'compression-levels.sh',
   'nix-copy-ssh.sh',
   'nix-copy-ssh-ng.sh',
   'pre-hook.sh',
diff --git a/tests/functional2/store/cache/__init__.py b/tests/functional2/store/cache/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/functional2/store/cache/test_compression_levels.py b/tests/functional2/store/cache/test_compression_levels.py
new file mode 100644
index 000000000..1a6d869f2
--- /dev/null
+++ b/tests/functional2/store/cache/test_compression_levels.py
@@ -0,0 +1,44 @@
+import re
+from pathlib import Path
+
+from functional2.testlib.fixtures.file_helper import with_files
+from functional2.testlib.fixtures.nix import Nix
+from functional2.testlib.utils import get_global_asset_pack
+
+
+@with_files(get_global_asset_pack("dependencies"))
+def test_compression_levels(nix: Nix):
+    cache_dir1 = nix.env.dirs.cache_dir / "test1"
+    cache_dir2 = nix.env.dirs.cache_dir / "test2"
+
+    nix.settings.feature("nix-command")
+    res = nix.nix_build(["dependencies.nix", "--no-out-link"]).run().ok()
+    out_path = res.stdout_plain
+
+    def get_size_for_level(level: int, c_dir: Path) -> int:
+        cpy_res = (
+            nix.nix(
+                [
+                    "copy",
+                    "--to",
+                    f"file://{c_dir}?compression=xz&compression-level={level}",
+                    out_path,
+                ],
+                build=True,
+            )
+            .run()
+            .ok()
+        )
+        assert "copying 4 paths..." in cpy_res.stderr_plain
+
+        size = 0
+        for f in c_dir.glob("*.narinfo"):
+            size += int(re.search(r"FileSize: (\d+)\n", f.read_text()).group(1))
+
+        return size
+
+    size_0 = get_size_for_level(0, cache_dir1)
+
+    size_5 = get_size_for_level(5, cache_dir2)
+
+    assert size_0 > size_5