Small formatting fixes

Changes suggested by ruff

Author: julianz-

cheroot/makefile.py

@@ -4,6 +4,7 @@
 import _pyio as io
 import socket
 import time
+
 from OpenSSL import SSL
 
 
@@ -34,8 +35,12 @@ def _flush_unlocked(self):
                 n = self.raw.write(bytes(self._write_buf))
             except io.BlockingIOError as e:
                 n = e.characters_writteni
-            except (SSL.WantReadError,SSL.WantWriteError, SSL.WantX509LookupError) as e:
-                # these errors require retries with the same data 
+            except (
+                SSL.WantReadError,
+                SSL.WantWriteError,
+                SSL.WantX509LookupError,
+            ):
+                # these errors require retries with the same data
                 # if some data has already been written
                 n = 0
             del self._write_buf[:n]

cheroot/test/test_ssl.py

@@ -10,6 +10,7 @@
 import threading
 import time
 import traceback
+from unittest import mock
 
 import pytest
 
@@ -40,7 +41,6 @@
     _get_conn_data,
     _probe_ipv6_sock,
 )
-from unittest import mock
 from ..wsgi import Gateway_10
 
 
@@ -627,38 +627,42 @@ def test_ssl_env(  # noqa: C901  # FIXME
         ),
     )
 
+
 class TestBufferedWriterSSLWantErrors:
-    
+    """Test SSL want error handling in BufferedWriter."""
+
     def setup_method(self):
+        """Set up test fixtures with mock raw socket and BufferedWriter."""
         self.mock_raw = mock.Mock()
         self.mock_raw.closed = False
         self.writer = BufferedWriter(self.mock_raw)
 
     def test_want_write_error_retry(self):
         """Test that WantWriteError causes retry with same data."""
-        test_data = b"hello world"
-        
+        test_data = b'hello world'
+
         self.mock_raw.write.side_effect = [
             OpenSSL.SSL.WantWriteError(),
-            len(test_data)
+            len(test_data),
         ]
-        
+
         result = self.writer.write(test_data)
         assert result == len(test_data)
         assert self.mock_raw.write.call_count == 2
 
     def test_want_read_error_retry(self):
         """Test that WantReadError causes retry with same data."""
-        test_data = b"test data"
-        
+        test_data = b'test data'
+
         self.mock_raw.write.side_effect = [
-            OpenSSL.SSL.WantReadError(), 
-            len(test_data)
+            OpenSSL.SSL.WantReadError(),
+            len(test_data),
         ]
-        
+
         result = self.writer.write(test_data)
         assert result == len(test_data)
 
+
 @pytest.mark.parametrize(
     'ip_addr',
     (