diff --git a/.github/workflows/unittest.yaml b/.github/workflows/unittest.yaml
index 7b884d149..4255f7797 100644
--- a/.github/workflows/unittest.yaml
+++ b/.github/workflows/unittest.yaml
@@ -24,6 +24,8 @@ jobs:
       run: |
         echo "${{ secrets.METAGPT_KEY_YAML }}" | base64 -d > config/key.yaml
         pytest tests/ --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml --cov=./metagpt/ --cov-report=xml:cov.xml --cov-report=html:htmlcov --durations=20
+    - name: Show coverage report
+      run: |
         coverage report -m
     - name: Upload pytest test results
       uses: actions/upload-artifact@v3
@@ -32,6 +34,7 @@ jobs:
         path: |
           ./junit/test-results-${{ matrix.python-version }}.xml
           ./htmlcov/
+          ./tests/data/rsp_cache_new.json
         retention-days: 3
       if: ${{ always() }}
       
\ No newline at end of file
diff --git a/tests/conftest.py b/tests/conftest.py
index 54a042e90..ed9c96277 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,17 +9,84 @@
 import asyncio
 import logging
 import re
-from unittest.mock import Mock
+import json
+from typing import Optional
+import os
 
 import pytest
 
 from metagpt.config import CONFIG, Config
-from metagpt.const import DEFAULT_WORKSPACE_ROOT
+from metagpt.const import DEFAULT_WORKSPACE_ROOT, TEST_DATA_PATH
 from metagpt.llm import LLM
+from metagpt.provider.openai_api import OpenAILLM
 from metagpt.logs import logger
 from metagpt.utils.git_repository import GitRepository
 
 
+class MockLLM(OpenAILLM):
+    rsp_cache: dict = {}
+
+    async def original_aask(
+        self,
+        msg: str,
+        system_msgs: Optional[list[str]] = None,
+        format_msgs: Optional[list[dict[str, str]]] = None,
+        timeout=3,
+        stream=True,
+    ):
+        """A copy of metagpt.provider.base_llm.BaseLLM.aask, we can't use super().aask because it will be mocked"""
+        if system_msgs:
+            message = self._system_msgs(system_msgs)
+        else:
+            message = [self._default_system_msg()] if self.use_system_prompt else []
+        if format_msgs:
+            message.extend(format_msgs)
+        message.append(self._user_msg(msg))
+        rsp = await self.acompletion_text(message, stream=stream, timeout=timeout)
+        return rsp
+
+    async def aask(
+        self,
+        msg: str,
+        system_msgs: Optional[list[str]] = None,
+        format_msgs: Optional[list[dict[str, str]]] = None,
+        timeout=3,
+        stream=True,
+    ) -> str:
+        if msg not in self.rsp_cache:
+            # Call the original unmocked method
+            rsp = await self.original_aask(msg, system_msgs, format_msgs, timeout, stream)
+            logger.info(f"added '{rsp[:10]}' ... to response cache")
+            self.rsp_cache[msg] = rsp
+            return rsp
+        else:
+            logger.info("use response cache")
+            return self.rsp_cache[msg]
+
+
+@pytest.fixture(scope="session")
+def rsp_cache():
+    model_version = CONFIG.openai_api_model
+    rsp_cache_file_path = TEST_DATA_PATH / f"rsp_cache_{model_version}.json"  # read repo-provided
+    new_rsp_cache_file_path = TEST_DATA_PATH / f"rsp_cache_new.json"  # exporting a new copy
+    if os.path.exists(rsp_cache_file_path):
+        with open(rsp_cache_file_path, "r") as f1:
+            rsp_cache_json = json.load(f1)
+    else:
+        rsp_cache_json = {}
+    yield rsp_cache_json
+    with open(new_rsp_cache_file_path, "w") as f2:
+        json.dump(rsp_cache_json, f2, indent=4, ensure_ascii=False)
+
+
+@pytest.fixture(scope="function")
+def llm_mock(rsp_cache, mocker):
+    llm = MockLLM()
+    llm.rsp_cache = rsp_cache
+    mocker.patch("metagpt.provider.base_llm.BaseLLM.aask", llm.aask)
+    yield mocker
+
+
 class Context:
     def __init__(self):
         self._llm_ui = None
@@ -40,12 +107,6 @@ def llm_api():
     logger.info("Tearing down the test")
 
 
-@pytest.fixture(scope="function")
-def mock_llm():
-    # Create a mock LLM for testing
-    return Mock()
-
-
 @pytest.fixture(scope="session")
 def proxy():
     pattern = re.compile(