diff --git a/tests/test_abacus_deltaspin.py b/tests/test_abacus_deltaspin.py
index d57b3cf4..f26369dd 100644
--- a/tests/test_abacus_deltaspin.py
+++ b/tests/test_abacus_deltaspin.py
@@ -1,29 +1,23 @@
 from __future__ import annotations
 
-import os
-import shutil
 import unittest
 
-import numpy as np
 from context import dpdata
 
-from dpdata.unit import LengthConversion
 
-class TestDeltaSpin():
-    """Make a test for the DeltaSpin module in ABACUS
-    
-    """
+class TestDeltaSpin:
+    """Make a test for the DeltaSpin module in ABACUS"""
 
     def OUTABACUS_to_system():
-        data = dpdata.LabeledSystem('./abacus.scf.deltaspin', fmt = 'abacus/scf')
+        data = dpdata.LabeledSystem("./abacus.scf.deltaspin", fmt="abacus/scf")
         print(data)
-        
+
     def system_to_npy():
-        data = dpdata.LabeledSystem('./abacus.scf.deltaspin', fmt = 'abacus/scf').to_deepmd_npy('./abacus.scf.deltaspin/')
+        data = dpdata.LabeledSystem(
+            "./abacus.scf.deltaspin", fmt="abacus/scf"
+        ).to_deepmd_npy("./abacus.scf.deltaspin/")
         print(data)
-        
-
 
 
 if __name__ == "__main__":
-    unittest.main()
\ No newline at end of file
+    unittest.main()