code: def test_get_summary():
      # dict, so that we could delete from it easily
      stats = OrderedDict(
          [
              ("fetched", 3),
              ("added", ["file1", "file2", "file3"]),
              ("deleted", ["file4", "file5"]),
              ("modified", ["file6", "file7"]),
          ]
      )
  
      assert (
          get_summary(stats.items())
          == "3 files fetched, 3 files added, 2 files deleted and 2 files modified"
      )
  
      del stats["fetched"]
      del stats["deleted"][1]
      assert (
          get_summary(stats.items())
          == "3 files added, 1 file deleted and 2 files modified"
      )
  
      del stats["deleted"][0]
      assert (
          get_summary(stats.items())
          == "3 files added and 2 files modified"
      )
  
      del stats["modified"]
      assert get_summary(stats.items()) == "3 files added"
  
      assert not get_summary([])
      assert not get_summary([("x", 0), ("y", [])])
      assert get_summary([("x", 1), ("y", [])]) == "1 file x"
  
imports: from collections import OrderedDict
  import pytest
  from dvc.utils.humanize import get_summary, truncate_text
label_desc: Use image node_id 1 for calling a global function with example usage: test_get_summary() without return types