Remove unit tests for OpenAI FileSearchTool parsing

Integration tests will cover this logic automatically as part of
the full message history snapshots, per code review feedback.

Author: gorkachea

tests/models/test_openai_responses.py

@@ -7533,56 +7533,3 @@ async def test_openai_responses_model_file_search_tool_stream(allow_model_reques
         if vector_store is not None:
             await async_client.vector_stores.delete(vector_store.id)
         await async_client.close()
-
-
-# Unit tests below validate the parsing logic.
-
-
-def test_map_file_search_tool_call():
-    """Test that _map_file_search_tool_call correctly creates builtin tool parts."""
-    from openai.types.responses import ResponseFileSearchToolCall
-
-    from pydantic_ai.models.openai import _map_file_search_tool_call  # type: ignore[reportPrivateUsage]
-
-    # Create a mock ResponseFileSearchToolCall
-    file_search_call = ResponseFileSearchToolCall(
-        id='fs_test123',
-        type='file_search_call',
-        status='completed',
-        queries=['test query 1', 'test query 2'],
-        results=None,
-    )
-
-    call_part, return_part = _map_file_search_tool_call(file_search_call, 'openai')
-
-    assert call_part.tool_name == 'file_search'
-    assert call_part.args == {'queries': ['test query 1', 'test query 2']}
-    assert call_part.tool_call_id == 'fs_test123'
-    assert call_part.provider_name == 'openai'
-
-    assert return_part.tool_name == 'file_search'
-    assert return_part.tool_call_id == 'fs_test123'
-    assert return_part.provider_name == 'openai'
-    assert return_part.content == {'status': 'completed'}
-
-
-def test_map_file_search_tool_call_queries_structure():
-    """Test that _map_file_search_tool_call correctly structures queries and results."""
-    from openai.types.responses import ResponseFileSearchToolCall
-
-    from pydantic_ai.models.openai import _map_file_search_tool_call  # type: ignore[reportPrivateUsage]
-
-    # Create a mock with empty queries list
-    file_search_call = ResponseFileSearchToolCall(
-        id='fs_empty',
-        type='file_search_call',
-        status='in_progress',
-        queries=[],
-        results=None,
-    )
-
-    call_part, return_part = _map_file_search_tool_call(file_search_call, 'openai')
-
-    assert call_part.args == {'queries': []}
-    assert return_part.content == {'status': 'in_progress'}
-    assert call_part.tool_call_id == return_part.tool_call_id