diff --git a/tests/metagpt/utils/test_common.py b/tests/metagpt/utils/test_common.py
index d3837ca8f..6474b1233 100644
--- a/tests/metagpt/utils/test_common.py
+++ b/tests/metagpt/utils/test_common.py
@@ -4,13 +4,20 @@
 @Time    : 2023/4/29 16:19
 @Author  : alexanderwu
 @File    : test_common.py
+@Modified by: mashenquan, 2023/11/21. Add unit tests.
 """
 
 import os
+from typing import Any, Set
 
 import pytest
+from pydantic import BaseModel
 
+from metagpt.actions import RunCode
 from metagpt.const import get_project_root
+from metagpt.roles.tutorial_assistant import TutorialAssistant
+from metagpt.schema import Message
+from metagpt.utils.common import any_to_str, any_to_str_set
 
 
 class TestGetProjectRoot:
@@ -21,10 +28,55 @@ class TestGetProjectRoot:
 
     def test_get_project_root(self):
         project_root = get_project_root()
-        assert project_root.name == "metagpt"
+        assert project_root.name == "MetaGPT"
 
     def test_get_root_exception(self):
         with pytest.raises(Exception) as exc_info:
             self.change_etc_dir()
             get_project_root()
         assert str(exc_info.value) == "Project root not found."
+
+    def test_any_to_str(self):
+        class Input(BaseModel):
+            x: Any
+            want: str
+
+        inputs = [
+            Input(x=TutorialAssistant, want="metagpt.roles.tutorial_assistant.TutorialAssistant"),
+            Input(x=TutorialAssistant(), want="metagpt.roles.tutorial_assistant.TutorialAssistant"),
+            Input(x=RunCode, want="metagpt.actions.run_code.RunCode"),
+            Input(x=RunCode(), want="metagpt.actions.run_code.RunCode"),
+            Input(x=Message, want="metagpt.schema.Message"),
+            Input(x=Message(""), want="metagpt.schema.Message"),
+            Input(x="A", want="A"),
+        ]
+        for i in inputs:
+            v = any_to_str(i.x)
+            assert v == i.want
+
+    def test_any_to_str_set(self):
+        class Input(BaseModel):
+            x: Any
+            want: Set
+
+        inputs = [
+            Input(
+                x=[TutorialAssistant, RunCode(), "a"],
+                want={"metagpt.roles.tutorial_assistant.TutorialAssistant", "metagpt.actions.run_code.RunCode", "a"},
+            ),
+            Input(
+                x={TutorialAssistant, RunCode(), "a"},
+                want={"metagpt.roles.tutorial_assistant.TutorialAssistant", "metagpt.actions.run_code.RunCode", "a"},
+            ),
+            Input(
+                x=(TutorialAssistant, RunCode(), "a"),
+                want={"metagpt.roles.tutorial_assistant.TutorialAssistant", "metagpt.actions.run_code.RunCode", "a"},
+            ),
+        ]
+        for i in inputs:
+            v = any_to_str_set(i.x)
+            assert v == i.want
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-s"])