diff --git a/tests/test_cli/test_cli.py b/tests/test_cli/test_cli.py
index 4812cf3c..d42c3898 100644
--- a/tests/test_cli/test_cli.py
+++ b/tests/test_cli/test_cli.py
@@ -34,7 +34,7 @@ class TestCli:
             pipe.pipe_parse()
             md_content = pipe.pipe_mk_markdown(image_dir, drop_mode="none")
             res_path = os.path.join(pdf_dev_path, "mineru", f"{demo_name}.md")
-            with open(res_path, "w", encoding="utf-8") as f:
+            with open(res_path, "w+", encoding="utf-8") as f:
                 f.write(md_content)