code: def test_add_two_image_providers(self):
      x = cellprofiler_core.image.ImageSetList()
      y = x.get_image_set(0)
      img1 = cellprofiler_core.image.Image(numpy.ones((10, 10)))
  
      def fn1(image_set, image_provider):
          assert (
              y == image_set
          ), "Callback was not called with the correct image set"
          return img1
  
      img2 = cellprofiler_core.image.Image(numpy.ones((5, 5)))
  
      def fn2(image_set, image_provider):
          assert (
              y == image_set
          ), "Callback was not called with the correct image set"
          return img2
  
      y.providers.append(
          cellprofiler_core.image.abstract_image._callback_image.CallbackImage(
              "IP1", fn1
          )
      )
      y.providers.append(
          cellprofiler_core.image.abstract_image._callback_image.CallbackImage(
              "IP2", fn2
          )
      )
      assert img1 == y.get_image(
          "IP1"
      ), "Failed to get correct first image"
      assert img2 == y.get_image(
          "IP2"
      ), "Failed to get correct second image"
  
file_path: CellProfiler/tests/core/image/test_image_set_list.py
imports: import numpy
  import cellprofiler_core.image
  import cellprofiler_core.image.abstract_image._callback_image
label_desc: Use image node_id 6 for calling the TestImageSetList obj's underlying member method code with example usage: obj.test_add_two_image_providers() and returns: img1, img2