diff --git a/tests/ai/test_clifford_ai.py b/tests/ai/test_clifford_ai.py
index a313810..be5b8d6 100644
--- a/tests/ai/test_clifford_ai.py
+++ b/tests/ai/test_clifford_ai.py
@@ -89,9 +89,7 @@ def test_clifford_wrong_url(monkeypatch, random_circuit_transpiled, backend):
         ai_optimized_circuit = ai_optimize_lf.run(random_circuit_transpiled)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Expecting value: line 1 column 1 (char 0)" in str(
-            e
-        )
+        assert "Expecting value: line 1 column 1 (char 0)" in str(e)
         assert type(e).__name__ == "JSONDecodeError"
 
 
diff --git a/tests/ai/test_linear_function_ai.py b/tests/ai/test_linear_function_ai.py
index cf69cea..2eb9753 100644
--- a/tests/ai/test_linear_function_ai.py
+++ b/tests/ai/test_linear_function_ai.py
@@ -99,9 +99,7 @@ def test_linear_function_wrong_url(monkeypatch, random_circuit_transpiled, backe
         ai_optimized_circuit = ai_optimize_lf.run(random_circuit_transpiled)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Expecting value: line 1 column 1 (char 0)" in str(
-            e
-        )
+        assert "Expecting value: line 1 column 1 (char 0)" in str(e)
         assert type(e).__name__ == "JSONDecodeError"
 
 
diff --git a/tests/ai/test_permutation_ai.py b/tests/ai/test_permutation_ai.py
index b83c708..c42a126 100644
--- a/tests/ai/test_permutation_ai.py
+++ b/tests/ai/test_permutation_ai.py
@@ -136,18 +136,14 @@ def test_permutation_wrong_url(monkeypatch, random_circuit_transpiled, backend):
     ai_optimize_lf = PassManager(
         [
             CollectPermutations(min_block_size=2, max_block_size=27),
-            AIPermutationSynthesis(
-                backend_name=backend, base_url="https://ibm.com/"
-            ),
+            AIPermutationSynthesis(backend_name=backend, base_url="https://ibm.com/"),
         ]
     )
     try:
         ai_optimized_circuit = ai_optimize_lf.run(random_circuit_transpiled)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Expecting value: line 1 column 1 (char 0)" in str(
-            e
-        )
+        assert "Expecting value: line 1 column 1 (char 0)" in str(e)
         assert type(e).__name__ == "JSONDecodeError"
 
 
diff --git a/tests/ai/test_routing_ai.py b/tests/ai/test_routing_ai.py
index e0403ad..d0e07ce 100644
--- a/tests/ai/test_routing_ai.py
+++ b/tests/ai/test_routing_ai.py
@@ -62,10 +62,11 @@ def test_routing_wrong_backend(random_circuit_transpiled):
         ai_optimized_circuit = ai_optimize_lf.run(random_circuit_transpiled)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "User doesn't have access to the specified backend: wrong_backend" in str(
-            e
+        assert (
+            "User doesn't have access to the specified backend: wrong_backend" in str(e)
         )
 
+
 @pytest.mark.skip(
     reason="Unreliable. It passes most of the times with the timeout of 1 second for the current circuits used"
 )
@@ -89,9 +90,7 @@ def test_routing_wrong_token(qv_circ, backend):
         ai_optimized_circuit = ai_optimize_lf.run(qv_circ)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Invalid authentication credentials" in str(
-            e
-        )
+        assert "Invalid authentication credentials" in str(e)
 
 
 def test_routing_wrong_url(monkeypatch, qv_circ, backend):
@@ -105,15 +104,11 @@ def test_routing_wrong_url(monkeypatch, qv_circ, backend):
         ai_optimized_circuit = ai_optimize_lf.run(qv_circ)
         pytest.fail("Error expected")
     except Exception as e:
-        assert "Expecting value: line 1 column 1 (char 0)" in str(
-           e
-        )
+        assert "Expecting value: line 1 column 1 (char 0)" in str(e)
         assert type(e).__name__ == "JSONDecodeError"
 
 
-def test_routing_unexisting_url(
-    monkeypatch, qv_circ, backend
-):
+def test_routing_unexisting_url(monkeypatch, qv_circ, backend):
     monkeypatch.undo()
     ai_optimize_lf = PassManager(
         [
@@ -129,7 +124,7 @@ def test_routing_unexisting_url(
     except Exception as e:
         print(e)
         assert (
-            "Error: HTTPSConnectionPool(host=\\\'invented-domain-qiskit-transpiler-service-123.com\\\', port=443):"
+            "Error: HTTPSConnectionPool(host=\\'invented-domain-qiskit-transpiler-service-123.com\\', port=443):"
             in str(e)
         )
         assert type(e).__name__ == "TranspilerError"