code: def test_overview_levels(path_cogeo_tif):
      """With sharing turned off, problem noted in #1504 vanishes"""
      olevel = 0
      with rasterio.open(path_cogeo_tif, overview_level=olevel) as src:
          assert src.shape == (512, 512)
  
          olevel = 1
          with rasterio.open(
              path_cogeo_tif, sharing=False, overview_level=olevel
          ) as src:
              assert src.shape == (256, 256)
  
              olevel = 2
              with rasterio.open(
                  path_cogeo_tif, sharing=False, overview_level=olevel
              ) as src:
                  assert src.shape == (128, 128)
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_overview_levels(path_cogeo_tif) without return types