new_contents: import itertools
  
  import numpy as np
  from numpy import testing
  from skimage.color.colorlabel import image_label2rgb
  from numpy.testing import assert_array_almost_equal as assert_close
  
  
  def test_shape_mismatch():
      image = np.ones((3, 3))
      label = np.ones((2, 2))
      testing.assert_raises(ValueError, image_label2rgb, image, label)
  
  
  def test_rgb():
      image = np.ones((1, 3))
      label = np.arange(3).reshape(1, -1)
      colors = [(1, 0, 0), (0, 1, 0), (0, 0, 1)]
      # Set alphas just in case the defaults change
      rgb = image_label2rgb(image, label, colors=colors, alpha=1, image_alpha=1)
      assert_close(rgb, [colors])
  
  
  def test_alpha():
      image = np.random.uniform(size=(3, 3))
      label = np.random.randint(0, 9, size=(3, 3))
      # If we set `alpha = 0`, then rgb should match image exactly.
      rgb = image_label2rgb(image, label, alpha=0, image_alpha=1)
      assert_close(rgb[..., 0], image)
      assert_close(rgb[..., 1], image)
      assert_close(rgb[..., 2], image)
  
  
  def test_image_alpha():
      image = np.random.uniform(size=(1, 3))
      label = np.arange(3).reshape(1, -1)
      colors = [(1, 0, 0), (0, 1, 0), (0, 0, 1)]
      # If we set `image_alpha = 0`, then rgb should match label colors exactly.
      rgb = image_label2rgb(image, label, colors=colors, alpha=1, image_alpha=0)
      assert_close(rgb, [colors])
  
  
  def test_color_names():
      image = np.ones((1, 3))
      label = np.arange(3).reshape(1, -1)
      cnames = ['red', 'lime', 'blue']
      colors = [(1, 0, 0), (0, 1, 0), (0, 0, 1)]
      # Set alphas just in case the defaults change
      rgb = image_label2rgb(image, label, colors=cnames, alpha=1, image_alpha=1)
      assert_close(rgb, [colors])
  
  
  def test_bg_and_color_cycle():
      image = np.zeros((1, 10))  # dummy image
      label = np.arange(10).reshape(1, -1)
      colors = [(1, 0, 0), (0, 0, 1)]
      bg_color = (0, 0, 0)
      rgb = image_label2rgb(image, label, bg_label=0, bg_color=bg_color,
                            colors=colors, alpha=1)
      assert_close(rgb[0, 0], bg_color)
      for pixel, color in zip(rgb[0, 1:], itertools.cycle(colors)):
          assert_close(pixel, color)
  
  
  if __name__ == '__main__':
      testing.run_module_suite()
  
  
subject: Add tests for image_label2rgb