diff --git a/tests/common/__init__.py b/tests/common/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/common/test_request_service.py b/tests/common/test_request_service.py
new file mode 100644
index 00000000..fade9419
--- /dev/null
+++ b/tests/common/test_request_service.py
@@ -0,0 +1,48 @@
+import unittest
+from unittest.mock import Mock
+import json
+from transbank.common.request_service import RequestService
+from transbank.error.transbank_error import TransbankError
+from tests.mocks.responses_api_mocks import responses
+
+
+class RequestServiceTestCase(unittest.TestCase):
+
+    def build_response(self, status_code, body=None):
+        response = Mock()
+        response.status_code = status_code
+        response.text = json.dumps(body) if body is not None else ''
+        return response
+
+    def test_process_response_200_with_body(self):
+        response = self.build_response(200, responses['commit_status_response'])
+
+        self.assertEqual(RequestService.process_response(response), responses['commit_status_response'])
+
+    def test_process_response_201_with_body(self):
+        response = self.build_response(201, responses['create_response'])
+
+        self.assertEqual(RequestService.process_response(response), responses['create_response'])
+
+    def test_process_response_204_without_body(self):
+        response = self.build_response(204)
+
+        self.assertEqual(RequestService.process_response(response), 204)
+
+    def test_process_response_422_with_error_message(self):
+        response = self.build_response(422, responses['commit_error'])
+
+        with self.assertRaises(TransbankError) as context:
+            RequestService.process_response(response)
+
+        self.assertEqual(context.exception.message, responses['commit_error']['error_message'])
+        self.assertEqual(context.exception.code, 422)
+
+    def test_process_response_500_with_description(self):
+        response = self.build_response(500, responses['general_error'])
+
+        with self.assertRaises(TransbankError) as context:
+            RequestService.process_response(response)
+
+        self.assertEqual(context.exception.message, responses['general_error']['description'])
+        self.assertEqual(context.exception.code, 500)
diff --git a/transbank/common/request_service.py b/transbank/common/request_service.py
index 389bef36..3c5720c7 100644
--- a/transbank/common/request_service.py
+++ b/transbank/common/request_service.py
@@ -36,7 +36,7 @@ def process_response(cls, response: any):
         if not response.text:
             return response.status_code
         dict_response = json.loads(response.text)
-        if response.status_code not in (200, 299):
+        if not 200 <= response.status_code < 300:
             if "error_message" in dict_response:
                 raise TransbankError(message=dict_response["error_message"], code=response.status_code)
             if "description" in dict_response: