diff --git a/tests/test_abacus_spin.py b/tests/test_abacus_spin.py
index 5a46ceea..4fcbc904 100644
--- a/tests/test_abacus_spin.py
+++ b/tests/test_abacus_spin.py
@@ -51,7 +51,7 @@ def test_scf(self):
         np.testing.assert_almost_equal(
             data["force_mags"], sys2.data["force_mags"], decimal=8
         )
-    
+
     def test_scf_nspin2(self):
         os.system("cp abacus.spin/INPUT.scf.nspin2 abacus.spin/INPUT")
         mysys = dpdata.LabeledSystem("abacus.spin", fmt="abacus/scf")
@@ -60,16 +60,16 @@ def test_scf_nspin2(self):
         np.testing.assert_almost_equal(
             data["spins"][0],
             [
-                [0,0,2.4000001004],
-                [0,0,2.3999994597],
+                [0, 0, 2.4000001004],
+                [0, 0, 2.3999994597],
             ],
             decimal=8,
         )
         np.testing.assert_almost_equal(
             data["force_mags"][0],
             [
-                [0,0, -0.3669618965],
-                [0,0, -0.3669821632],
+                [0, 0, -0.3669618965],
+                [0, 0, -0.3669821632],
             ],
             decimal=8,
         )
@@ -85,7 +85,6 @@ def test_scf_nspin2(self):
             data["force_mags"], sys2.data["force_mags"], decimal=8
         )
 
-
     def test_relax(self):
         os.system("cp abacus.spin/INPUT.relax abacus.spin/INPUT")
         mysys = dpdata.LabeledSystem("abacus.spin", fmt="abacus/relax")