diff --git a/tests/test_data_manager.py b/tests/test_data_manager.py
index 1d96c6bd8792bec572366f1a8cd85e91fea2a774..1ea3f856dc46e182b70bc2aff570b50551a13c4d 100644
--- a/tests/test_data_manager.py
+++ b/tests/test_data_manager.py
@@ -6,12 +6,27 @@ Author:         Bo Zhang
 Created:        2022-09-13
 Modified-History:
     2022-09-13, Bo Zhang, created
-    2022-09-13, Bo Zhang, fixed a bug
+    2022-09-29, Bo Zhang, added test for CsstMbiDataManager
 """
+import os
 import unittest
 from csst_common.data_manager import CsstMbiDataManager
 
 
+class TestDataManager(unittest.TestCase):
+    def setUp(self) -> None:
+        self.dm = CsstMbiDataManager.quickstart(ver_sim="C5.2", dir_l1=".", exposure_id=100)
+
+    def test_l0data_existence(self):
+        self.assertTrue(self.dm.available_detectors == 18)
+        self.assertTrue(os.path.exists(self.dm.l0_detector(6)))
+        self.assertTrue(os.path.exists(self.dm.l0_log(6)))
+        self.assertTrue(os.path.exists(self.dm.l0_cat(6)))
+        self.assertTrue(os.path.exists(self.dm.l0_crs(6)))
+        self.assertTrue(isinstance(self.dm.l1_detector(6, post="img.fits"), str))
+        self.assertTrue(isinstance(self.dm.l1_file(name="some_file.ext", comment="a demo file"), str))
+
+
 class TestParams(unittest.TestCase):
     def test_params(self):
         self.assertTrue(True)