text: import numpy as np
  import unittest
  from numpy.testing import assert_array_equal
  from pims.image_sequence import customize_image_sequence
  
  
  @unittest.FunctionTestCase
  def test_customize_image_sequence():
      dummy = lambda filename, **kwargs: np.zeros((1, 1))
      reader = customize_image_sequence(dummy)
      result = reader(['a', 'b', 'c'])
      actual_len = len(result)
      assert actual_len == 3
      for frame in result:
          assert_array_equal(frame, np.zeros((1, 1)))
      reader2 = customize_image_sequence(dummy, 'my_name')
      assert reader2.__name__ == 'my_name'
  