code: def test_calculate_zoom_level_stats_with_fullscan_ranging_strategy():
      full_extent = (
          -MERCATOR_CONST,
          -MERCATOR_CONST,
          MERCATOR_CONST,
          MERCATOR_CONST,
      )
      level = 0
      color_ranging_strategy = "fullscan"
      super_tiles, span = calculate_zoom_level_stats(
          list(gen_super_tiles(full_extent, level)),
          mock_load_data_func,
          mock_rasterize_func,
          color_ranging_strategy=color_ranging_strategy,
      )
  
      assert isinstance(span, (list, tuple))
      assert len(span) == 2
      assert_is_numeric(span[0])
      assert_is_numeric(span[1])
  
file_path: datashader/datashader/tests/test_tiles.py
imports: from __future__ import annotations
  import datashader
  import datashader.transfer_functions
  from datashader.colors import viridis
  from datashader.tiles import render_tiles
  from datashader.tiles import gen_super_tiles
  from datashader.tiles import _get_super_tile_min_max
  from datashader.tiles import calculate_zoom_level_stats
  from datashader.tiles import MercatorTileDefinition
  import numpy
  import pandas
label_desc: Use image node_id 8 for calling a global function with example usage: test_calculate_zoom_level_stats_with_fullscan_ranging_strategy() without return types