diff --git a/tests/metagpt/tools/libs/test_cr.py b/tests/metagpt/tools/libs/test_cr.py
new file mode 100644
index 000000000..788062211
--- /dev/null
+++ b/tests/metagpt/tools/libs/test_cr.py
@@ -0,0 +1,92 @@
+import json
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+import pytest_asyncio
+
+from metagpt.tools.libs.cr import CodeReview
+
+
+class MockFile:
+    def __init__(self, content):
+        self.content = content
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        pass
+
+    async def read(self):
+        return self.content
+
+
+@pytest.mark.asyncio
+class TestCodeReview:
+    @pytest_asyncio.fixture(autouse=True)
+    async def setup(self):
+        """Fixture to initialize the CodeReview instance."""
+        self.cr = CodeReview()
+
+    @patch("aiofiles.open", new_callable=MagicMock)
+    @patch("metagpt.utils.report.EditorReporter.async_report", new_callable=AsyncMock)
+    @patch("metagpt.ext.cr.actions.code_review.CodeReview.run", new_callable=AsyncMock)
+    async def test_review(self, mock_run, mock_report, mock_aiofiles_open):
+        """Test the review method with a local patch file."""
+        # mock patch_content
+        patch_content = """diff --git a/test.py b/test.py
+index 1234567..89abcde 100644
+--- a/test.py
++++ b/test.py
+@@ -1,3 +1,3 @@
+ def foo():
+-    print("Hello")
++    print("World")
+-    print("Another line")
++    print("Another modified line")"""
+
+        # mock point file content
+        point_file_content = json.dumps([{"id": 1, "description": "Test point"}])
+
+        mock_patch_file = MockFile(patch_content)
+        mock_point_file = MockFile(point_file_content)
+        mock_aiofiles_open.side_effect = [mock_patch_file, mock_point_file]
+
+        mock_run.return_value = [{"comment": "Fix this line"}]
+
+        # run
+        result = await self.cr.review(patch_path="test.patch", output_file="output.json")
+
+        # assert
+        assert "The number of defects: 1" in result
+        mock_run.assert_called_once()
+        mock_report.assert_called()
+
+    @patch("aiofiles.open", new_callable=MagicMock)
+    @patch("metagpt.ext.cr.actions.modify_code.ModifyCode.run", new_callable=AsyncMock)
+    async def test_fix(self, mock_run, mock_aiofiles_open):
+        """Test the fix method."""
+        patch_content = """diff --git a/test.py b/test.py
+index 1234567..89abcde 100644
+--- a/test.py
++++ b/test.py
+@@ -1,3 +1,3 @@
+ def foo():
+-    print("Hello")
++    print("World")
+-    print("Another line")
++    print("Another modified line")"""
+
+        cr_file_content = json.dumps([{"comment": "Fix this line"}])
+
+        # mock file obj
+        mock_path_file = MockFile(patch_content)
+        mock_cr_file = MockFile(cr_file_content)
+        mock_aiofiles_open.side_effect = [mock_path_file, mock_cr_file]
+
+        # run fix
+        result = await self.cr.fix(patch_path="test.patch", cr_file="cr.json", output_dir="output")
+
+        # assert
+        assert "The fixed patch files store in output" in result
+        mock_run.assert_called_once()