code: def test_resolve_request_headers(mock_request_header_providers):
      request_headers_arg = {"two": "arg-override", "arg": "arg-val"}
      assert resolve_request_headers(request_headers_arg) == {
          "one": "one-val override",
          "two": "arg-override",
          "three": "three-val",
          "new": "new-val",
          "arg": "arg-val",
      }
  
file_path: mlflow/tests/tracking/request_header/test_registry.py
imports: from importlib import reload
  from unittest import mock
  import pytest
  import mlflow.tracking.request_header.registry
  from mlflow.tracking.request_header.databricks_request_header_provider import DatabricksRequestHeaderProvider
  from mlflow.tracking.request_header.registry import RequestHeaderProviderRegistry, resolve_request_headers
label_desc: Use image node_id 10 for calling a global function with example usage: test_resolve_request_headers(mock_request_header_providers) without return types