fix flake and pylint errors and add black

Pipfile

@@ -2,6 +2,7 @@
 flake8 = "*"
 mypy = "*"
 pylint = "*"
+black = "*"
 pytest = "<8.0.0"
 python-dotenv = "*"
 backoff = "*"

tests/integration/asserts.py

@@ -11,18 +11,24 @@ def assert_resource(resource: threescale_api.defaults.DefaultResource):
     assert resource.entity is not None
 
 
-def assert_errors_contains(resource: threescale_api.defaults.DefaultClient, fields: List[str]):
-    errors = resource['errors']
+def assert_errors_contains(
+    resource: threescale_api.defaults.DefaultClient, fields: List[str]
+):
+    errors = resource["errors"]
     assert errors is not None
     for field in fields:
         assert field in errors
 
 
-def assert_resource_params(obj: threescale_api.defaults.DefaultResource, params: dict, allowed=None):
-    for (key, val) in params.items():
+def assert_resource_params(
+    obj: threescale_api.defaults.DefaultResource, params: dict, allowed=None
+):
+    for key, val in params.items():
         if allowed is not None and key in allowed:
-            assert obj[key] == val, f"Resource value for key \"{key}\" should be correct."
-            assert obj.entity[key] == val, "Entity value for key \"{key}\" should be correct."
+            assert obj[key] == val, f'Resource value for key "{key}" should be correct.'
+            assert (
+                obj.entity[key] == val
+            ), 'Entity value for key "{key}" should be correct.'
 
 
 def assert_http_ok(response: requests.Response):