diff --git a/tests/test_client.py b/tests/test_client.py
index 6d89302..5dc5d62 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -48,11 +48,13 @@ def test_cm_noisy_simulator(self):
         self.assertTrue(".pkl" in response.json)
 
         response_get = self.client.get(
-            "/cm/?noise_model=" + backend +
-            "&cm_gen_method=" + "standard" +
-            "&qpu=aer_qasm_simulator" +
-            "&qubits=0&qubits=1&qubits=2&qubits=3&qubits=4"+
-            "&max_age=360"
+            "/cm/?noise_model="
+            + backend
+            + "&cm_gen_method="
+            + "standard"
+            + "&qpu=aer_qasm_simulator"
+            + "&qubits=0&qubits=1&qubits=2&qubits=3&qubits=4"
+            + "&max_age=360"
         )
         self.assertEqual(response_get.status_code, 200)
         self.assertEqual(len(response_get.json), 32)
@@ -191,12 +193,13 @@ def test_mm_noisy_simulator_only_measure(self):
         self.assertTrue(".pkl" in response.json)
 
         response_get = self.client.get(
-            "/mm/?noise_model=" + backend +
-            "&cm_gen_method=standard" +
-            "&mitigation_method=inversion" +
-            "&qpu=aer_qasm_simulator" +
-            "&qubits=0&qubits=1&qubits=2&qubits=3&qubits=4"+
-            "&max_age=360"
+            "/mm/?noise_model="
+            + backend
+            + "&cm_gen_method=standard"
+            + "&mitigation_method=inversion"
+            + "&qpu=aer_qasm_simulator"
+            + "&qubits=0&qubits=1&qubits=2&qubits=3&qubits=4"
+            + "&max_age=360"
         )
         self.assertEqual(response_get.status_code, 200)
         self.assertEqual(len(response_get.json), 32)
diff --git a/tests/utils_test.py b/tests/utils_test.py
index baad376..745a576 100644
--- a/tests/utils_test.py
+++ b/tests/utils_test.py
@@ -1,8 +1,9 @@
 from qiskit_ibm_provider import IBMProvider
 
+
 def get_available_qpu(credentials):
     provider = IBMProvider(**credentials)
     backends = provider.backends()
     for backend in backends:
-        if 'simulator' not in backend.name:
-            return backend.name
\ No newline at end of file
+        if "simulator" not in backend.name:
+            return backend.name