diff --git a/tests.py b/tests.py
index 45b15bdfaafdec76c18483df677ce3e744d8b580..7e4a9c3fe09a0650bd76ea8f2cc3d7ecaddd112e 100644
--- a/tests.py
+++ b/tests.py
@@ -239,7 +239,9 @@ def test_install_environment_zlib():
     #         "cp -r foss2021a-mpi fuss1999a", shell=True, capture_output=True
     #     )
     # add zlib as a spec to global_generic
-    with open(package_set_src_dir / "global_generic" / "global_packages.list", "w") as f:
+    with open(
+        package_set_src_dir / "global_generic" / "global_packages.list", "w"
+    ) as f:
         f.write("zlib@1.2.13 \n")
 
     # add zlib to whitelist of module creation file by replacing anaconda3%gcc@10.2.1