new_contents: import logging
  import sys
  import uuid
  
  import numpy as np
  import pytest
  
  import rasterio
  
  
  logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
  
  
  @pytest.fixture(scope='function')
  def tempfile():
      """A temporary filename in the GDAL '/vsimem' filesystem"""
      return '/vsimem/{}'.format(uuid.uuid4())
  
  
  def complex_image(height, width, dtype):
      """An array with sequential elements"""
      return np.array(
          [complex(x, x) for x in range(height * width)],
          dtype=dtype).reshape(height, width)
  
  dtypes = ['complex', 'complex64', 'complex128']
  
  
  @pytest.mark.parametrize("dtype", dtypes)
  @pytest.mark.parametrize("height,width", [(20, 20)])
  def test_read_array(tempfile, dtype, height, width):
      """_io functions read and write arrays correctly"""
      in_img = complex_image(height, width, dtype)
      with rasterio.open(tempfile, 'w', driver='GTiff', dtype=dtype,
                         height=height, width=width, count=1) as dataset:
          dataset.write(in_img, 1)
          out_img = dataset.read(1)
      assert (in_img == out_img).all()
  
subject: Add test of complex types