diff --git a/tests/metagpt/tools/libs/test_env.py b/tests/metagpt/tools/libs/test_env.py
new file mode 100644
index 000000000..d3a2bb19e
--- /dev/null
+++ b/tests/metagpt/tools/libs/test_env.py
@@ -0,0 +1,64 @@
+import os
+from unittest.mock import AsyncMock
+
+import pytest
+
+from metagpt.tools.libs.env import (
+    EnvKeyNotFoundError,
+    default_get_env_description,
+    get_env,
+    get_env_default,
+    set_get_env_entry,
+)
+
+
+@pytest.mark.asyncio
+class TestEnv:
+    @pytest.fixture(autouse=True)
+    def setup_and_teardown(self):
+        """Setup and teardown for environment variables."""
+        self.mock_os_env = {
+            "TEST_APP-KEY": "value1",
+            "TEST_APP_KEY": "value2",
+        }
+        os.environ.update(self.mock_os_env)
+        yield
+        # Clear added environment variables
+        for key in self.mock_os_env.keys():
+            del os.environ[key]
+
+    async def test_get_env(self):
+        """Test retrieving an environment variable."""
+        result = await get_env("KEY", app_name="TEST_APP")
+        assert result == "value1"
+
+        with pytest.raises(EnvKeyNotFoundError):
+            await get_env("NON_EXISTENT_KEY")
+
+        # Using no app_name
+        result = await get_env("TEST_APP_KEY")
+        assert result == "value2"
+
+    async def test_get_env_default(self):
+        """Test retrieving environment variable with default value."""
+        result = await get_env_default("NON_EXISTENT_KEY", app_name="TEST_APP", default_value="default")
+        assert result == "default"
+
+    async def test_get_env_description(self):
+        """Test retrieving descriptions for environment variables."""
+        descriptions = await default_get_env_description()
+
+        assert 'await get_env(key="KEY", app_name="TEST_APP")' in descriptions
+        assert (
+            descriptions['await get_env(key="KEY", app_name="TEST_APP")']
+            == "Return the value of environment variable `TEST_APP-KEY`."
+        )
+
+    async def test_set_get_env_entry(self):
+        """Test overriding get_env functionality."""
+        mock_get_env_value = "mocked_value"
+        mock_func = AsyncMock(return_value=mock_get_env_value)
+        set_get_env_entry(mock_func, default_get_env_description)
+
+        result = await get_env("set_get_env")
+        assert result == mock_get_env_value