diff --git a/tests/test_conjugate_gradient.py b/tests/test_conjugate_gradient.py
index 239dbe3ecd..64efe3b168 100644
--- a/tests/test_conjugate_gradient.py
+++ b/tests/test_conjugate_gradient.py
@@ -19,6 +19,7 @@
 
 
 class TestConjugateGradient(unittest.TestCase):
+
     def test_real_valued_inverse(self):
         """Test ConjugateGradient with real-valued input: when the input is real
         value, the output should be the inverse of the matrix."""
diff --git a/tests/test_sure_loss.py b/tests/test_sure_loss.py
index 945da657bf..903f9bd2ca 100644
--- a/tests/test_sure_loss.py
+++ b/tests/test_sure_loss.py
@@ -19,6 +19,7 @@
 
 
 class TestSURELoss(unittest.TestCase):
+
     def test_real_value(self):
         """Test SURELoss with real-valued input: when the input is real value, the loss should be 0.0."""
         sure_loss_real = SURELoss(perturb_noise=torch.zeros(2, 1, 128, 128), eps=0.1)