fix: Used black to fix linter error

Author: tanasecucliciu

tests/test_watcher_ex.py

@@ -16,6 +16,7 @@
 from tests.test_enforcer import get_examples, TestCaseBase
 from unittest import IsolatedAsyncioTestCase
 
+
 class SampleWatcher:
     def __init__(self):
         self.callback = None
@@ -113,7 +114,7 @@ def start_watch(self):
         pass
 
 
-class AsyncSampleWatcher():
+class AsyncSampleWatcher:
     def __init__(self):
         self.callback = None
         self.notify_message = None
@@ -292,7 +293,7 @@ def get_enforcer(self, model=None, adapter=None):
             model,
             adapter,
         )
-    
+
     async def test_auto_notify_enabled(self):
         e = self.get_enforcer(
             get_examples("basic_model.conf"),
@@ -328,7 +329,6 @@ async def test_auto_notify_enabled(self):
         await e.remove_policies(rules)
         self.assertEqual(w.notify_message, "called remove policies")
 
-
     async def test_auto_notify_disabled(self):
         e = self.get_enforcer(
             get_examples("basic_model.conf"),
@@ -364,4 +364,4 @@ async def test_auto_notify_disabled(self):
         self.assertEqual(w.notify_message, None)
 
         await e.remove_policies(rules)
-        self.assertEqual(w.notify_message, None)
+        self.assertEqual(w.notify_message, None)