diff --git a/test_atomic_write_perms.py b/test_atomic_write_perms.py
new file mode 100644
index 00000000..d4e41881
--- /dev/null
+++ b/test_atomic_write_perms.py
@@ -0,0 +1,34 @@
+
+import sys
+from pathlib import Path
+
+# Add src/utils to path to import atomic_write directly
+sys.path.append(str(Path("src/utils").resolve()))
+
+from atomic_write import atomic_write
+import os
+import stat
+
+def test_atomic_write_permissions():
+    test_file = Path("test_permissions.txt")
+    if test_file.exists():
+        test_file.unlink()
+
+    def write_op(f):
+        f.write("content")
+
+    atomic_write(test_file, write_op)
+
+    st = test_file.stat()
+    mode = stat.S_IMODE(st.st_mode)
+    print(f"File permissions: {oct(mode)}")
+
+    if mode == 0o600:
+        print("SUCCESS: Permissions are 0o600")
+    else:
+        print(f"FAILURE: Permissions are {oct(mode)}")
+
+    test_file.unlink()
+
+if __name__ == "__main__":
+    test_atomic_write_permissions()