@@ -786,9 +786,7 @@ def _check_shape(M, n, m, square=False, symmetric=False, name="??"):
 
 # Utility function to check if a matrix is symmetric
 def _is_symmetric(M):
-
     M = np.atleast_2d(M)
-
     if isinstance(M[0, 0], inexact):
         return (
             np.linalg.norm(M - M.conj().T, 1)
 
@@ -466,26 +466,24 @@ def test_raise(self):
                 cdare(A, B, Qfs, R, S, E)
             with pytest.raises(ControlArgument):
                 cdare(A, B, Q, Rfs, S, E)
+
     def test_is_symmetric_scale_aware(self):
         M = np.array([
             [1e8, 1e8],
             [1e8 + 1e-8, 1e8]
         ])
-
         assert _is_symmetric(M)
+
     def test_is_symmetric_rejects_asymmetric(self):
         M = np.array([
             [1., 2.],
             [5., 1.]
         ])
-
         assert not _is_symmetric(M)
 
-
     def test_is_symmetric_complex_hermitian(self):
         M = np.array([
             [1., 2. + 1.j],
             [2. - 1.j, 3.]
         ])
-
         assert _is_symmetric(M)