Convert formatting to use ruff instead of yapf + isort (#26247)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

tests/detokenizer/test_stop_string_while_stop_model_terminates.py

@@ -14,7 +14,6 @@ def include_stop_str_in_output(request):
 
 
 class _DummyDetokenizer(BaseIncrementalDetokenizer):
-
     def __init__(self, request: EngineCoreRequest):
         super().__init__(request)
 
@@ -27,7 +26,8 @@ def _make_request(stop, include_stop_str_in_output: bool, min_tokens: int = 0):
     params = SamplingParams(
         stop=stop,
         include_stop_str_in_output=include_stop_str_in_output,
-        min_tokens=min_tokens)
+        min_tokens=min_tokens,
+    )
     # Keep other fields minimal for unit test purposes.
     req = EngineCoreRequest(
         request_id="test",
@@ -44,26 +44,25 @@ def _make_request(stop, include_stop_str_in_output: bool, min_tokens: int = 0):
     return req
 
 
-def test_stop_string_while_stop_token_terminates(
-        include_stop_str_in_output: bool):
+def test_stop_string_while_stop_token_terminates(include_stop_str_in_output: bool):
     """
     This test verifies that the detokenizer correctly handles the case where
     the generated token sequence contains both:
     - a stop token
     - an <eos> token
-    
+
     The detokenizer should respect the stop string and truncate the output
     accordingly.
-    
+
     Imagine the following sequence:
     - "abcdeZ" is generated, where "Z" is the <eos> token.
     - "cd" is the stop string.
-    
+
     If include_stop_str_in_output=False, the detokenizer should truncate the
     output to "ab" because the stop string "cd" is excluded.
     If include_stop_str_in_output=True, the detokenizer should include the stop
     string "cd" in the output, resulting in "abcd".
-    
+
 
     This verifies the behavioral change introduced in BaseIncrementalDetokenizer
     where stop-string evaluation occurs before the early-return on
@@ -78,8 +77,9 @@ def test_stop_string_while_stop_token_terminates(
     token_ids = [ord(c) for c in generated_text]
 
     # Create a request with the stop string and initialize the detokenizer.
-    req = _make_request(stop=[stop_string],
-                        include_stop_str_in_output=include_stop_str_in_output)
+    req = _make_request(
+        stop=[stop_string], include_stop_str_in_output=include_stop_str_in_output
+    )
     detok = _DummyDetokenizer(req)
 
     # Simulate that the last token ('Z') is a stop token (stop_terminated=True).
@@ -99,5 +99,4 @@ def test_stop_string_while_stop_token_terminates(
 
     # get_next_output_text should return the full text when finished=True.
     # (Buffering only applies during streaming when finished=False.)
-    assert detok.get_next_output_text(finished=True,
-                                      delta=False) == expected_text
+    assert detok.get_next_output_text(finished=True, delta=False) == expected_text