diff --git a/src/ecdsa/test_jacobi.py b/src/ecdsa/test_jacobi.py
index 50650280..f811b922 100644
--- a/src/ecdsa/test_jacobi.py
+++ b/src/ecdsa/test_jacobi.py
@@ -666,15 +666,9 @@ def test_mul_add_with_doubled_negation_of_itself(self):
         self.assertEqual(j_g.mul_add(4, dbl_neg, 2), INFINITY)
 
     @given(
-        st.integers(
-            min_value=0, max_value=int(generator_112r2.order() - 1)
-        ),
-        st.integers(
-            min_value=0, max_value=int(generator_112r2.order() - 1)
-        ),
-        st.integers(
-            min_value=0, max_value=int(generator_112r2.order() - 1)
-        )
+        st.integers(min_value=0, max_value=int(generator_112r2.order() - 1)),
+        st.integers(min_value=0, max_value=int(generator_112r2.order() - 1)),
+        st.integers(min_value=0, max_value=int(generator_112r2.order() - 1)),
     )
     @example(693, 2, 3293)  # values that will hit all the conditions for NAF
     def test_mul_add_random(self, mul1, mul2, mul3):
@@ -893,6 +887,7 @@ def interrupter(barrier_start, barrier_end, lock_exit):
 
 class TestZeroCurve(unittest.TestCase):
     """Tests with curve that has (0, 0) on the curve."""
+
     def setUp(self):
         self.curve = CurveFp(23, 1, 0)
 
diff --git a/src/ecdsa/test_pyecdsa.py b/src/ecdsa/test_pyecdsa.py
index 6c0266e8..41878959 100644
--- a/src/ecdsa/test_pyecdsa.py
+++ b/src/ecdsa/test_pyecdsa.py
@@ -856,18 +856,18 @@ def test_hybrid_decoding_with_blocked_format(self):
 
         self.assertIn("Invalid X9.62 encoding", str(exp.exception))
 
-    def test_hybrid_decoding_with_inconsistent_encoding_and_no_validation(self):
+    def test_hybrid_decoding_with_inconsistent_encoding_and_no_validation(
+        self,
+    ):
         sk = SigningKey.from_secret_exponent(123456789)
         vk = sk.verifying_key
 
         enc = vk.to_string("hybrid")
-        self.assertEqual(enc[:1], b'\x06')
-        enc = b'\x07' + enc[1:]
+        self.assertEqual(enc[:1], b"\x06")
+        enc = b"\x07" + enc[1:]
 
         b = VerifyingKey.from_string(
-            enc,
-            valid_encodings=("hybrid",),
-            validate_point=False
+            enc, valid_encodings=("hybrid",), validate_point=False
         )
 
         self.assertEqual(vk, b)
@@ -919,8 +919,8 @@ def test_decoding_with_inconsistent_hybrid_odd_point(self):
         vk = sk.verifying_key
 
         enc = vk.to_string("hybrid")
-        self.assertEqual(enc[:1], b'\x07')
-        enc = b'\x06' + enc[1:]
+        self.assertEqual(enc[:1], b"\x07")
+        enc = b"\x06" + enc[1:]
 
         with self.assertRaises(MalformedPointError):
             b = VerifyingKey.from_string(enc, valid_encodings=("hybrid",))