test(responses): add status transition test and remove Meta copyright

Address PR review feedback:
- Add test asserting that OpenAIResponseOutputMessageFunctionToolCall
  status transitions from in_progress to completed while preserving
  the same id via model_copy.
- Remove Meta Platforms copyright block from test file.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Ian Miller <milleryan2003@gmail.com>

Author: r3v5

tests/unit/providers/responses/builtin/test_openai_response_model_fields.py

@@ -4,12 +4,6 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-# Copyright (c) Meta Platforms, Inc. and affiliates.
-# All rights reserved.
-#
-# This source code is licensed under the terms described in the LICENSE file in
-# the root directory of this source tree.
-
 """Tests that id and status fields are always str (never None) on response models."""
 
 import pytest
@@ -78,6 +72,13 @@ def test_none_status_rejected(self):
         with pytest.raises(ValidationError):
             OpenAIResponseOutputMessageFunctionToolCall(call_id="call_123", name="func", arguments="{}", status=None)
 
+    def test_status_transition_preserves_id(self):
+        tc = OpenAIResponseOutputMessageFunctionToolCall(call_id="call_123", name="func", arguments="{}")
+        assert tc.status == "in_progress"
+        completed = tc.model_copy(update={"status": "completed"})
+        assert completed.status == "completed"
+        assert completed.id == tc.id
+
 
 class TestOpenAIResponseInputFunctionToolCallOutputFields:
     def test_default_id_is_str(self):