code: def test_rpcs_to_gdal():
      rpcs = RPC(**TEST_RPCS_NATIVE_PYTHON)
      for key, value in rpcs.to_gdal().items():
          assert key in TEST_RPCS_FROM_GDAL.keys()
          assert isinstance(value, str)
  
file_path: rasterio/tests/test_rpcs.py
imports: import rasterio
  from rasterio.rpc import RPC
label_desc: Use image node_id 2 for calling a global function with example usage: test_rpcs_to_gdal() without return types