code: def test_is_complex_int():
      assert _is_complex_int("complex_int16")
  
imports: import numpy
  import pytest
  from .conftest import gdal_version
  import rasterio
  from rasterio import ubyte, uint8, uint16, uint32, uint64, int8, int16, int32, int64, float32, float64, complex_, complex_int16
  from rasterio.dtypes import _gdal_typename, is_ndarray, check_dtype, get_minimum_dtype, can_cast_dtype, validate_dtype, _is_complex_int, _getnpdtype, _get_gdal_dtype
label_desc: Use image node_id 14 for calling a global function with example usage: test_is_complex_int() without return types