diff --git a/tests.py b/tests.py
index b79ccf1de747c90c5628195cc3a741deff36d6c3..31b69dd80d33c085b2c1ad5d1e73d2f7c97e8205 100644
--- a/tests.py
+++ b/tests.py
@@ -26,12 +26,15 @@ def test_os_chdir(tmp_path):
 
 
 def test_run_method(tmp_path):
+    """Run tests for run method."""
+
     run = mod.run
 
     # test a command with options:
     assert run(["date", "+%Y-%m-%d"]).returncode == 0
     assert run("date +%Y-%m-%d", shell=True).returncode == 0
 
+    # tests interacting with the file system
     with mod.os_chdir(str(tmp_path)):
         # ensure single string command works
         assert run(("ls -l"), shell=True).returncode == 0