test: improve test_load_filtered_policy_with_comments in test_filter.py

tests/test_filter.py

@@ -291,14 +291,20 @@ def test_filter_words_edge_cases(self):
 
     def test_load_filtered_policy_with_comments(self):
         """Test loading filtering policies with comments."""
-        temp_file = tempfile.NamedTemporaryFile(delete=False)
-        try:
-            shutil.copyfile(get_examples("rbac_with_domains_policy.csv"), temp_file.name)
+        import tempfile
+        import shutil
+
+        with tempfile.NamedTemporaryFile(mode="w+", delete=False) as temp_file:
+            with open(get_examples("rbac_with_domains_policy.csv"), "r") as source:
+                shutil.copyfileobj(source, temp_file)
 
-            with open(temp_file.name, "a") as f:
-                f.write("\n# This is a comment\np, admin, domain1, data3, read")
+            temp_file.write("\n# This is a comment\np, admin, domain1, data3, read")
+            temp_file.flush()
 
-            adapter = FilteredFileAdapter(temp_file.name)
+            temp_path = temp_file.name
+
+        try:
+            adapter = FilteredFileAdapter(temp_path)
             e = casbin.Enforcer(get_examples("rbac_with_domains_model.conf"), adapter)
             filter = Filter()
             filter.P = ["", "domain1"]
@@ -307,4 +313,7 @@ def test_load_filtered_policy_with_comments(self):
             e.load_filtered_policy(filter)
             self.assertTrue(e.has_policy(["admin", "domain1", "data3", "read"]))
         finally:
-            os.unlink(temp_file.name)
+            try:
+                os.unlink(temp_path)
+            except OSError:
+                pass