code: def test_colorbar_label_change():
      with TestingCanvas() as c:
          colorbar = create_colorbar(
              pos=(50, 50), size=(60, 4), orientation="top"
          )
          colorbar.cmap = "ice"
          orig_text_vis = colorbar.label
          colorbar.label = "New Label"
          assert colorbar.label.text == "New Label"
          assert colorbar.label is orig_text_vis
  
          c.draw_visual(colorbar)
  
file_path: vispy/vispy/visuals/tests/test_colorbar.py
imports: from vispy.scene import visuals
  from vispy.testing import requires_application, TestingCanvas, run_tests_if_main, raises
  from vispy.testing.image_tester import assert_image_approved
label_desc: Use image node_id 5 for calling a global function with example usage: test_colorbar_label_change() without return types