code: def test_fixed_splitter(records):
      presplits = [["file4", "file3"], ["file2"], ["file1"]]
  
      data_splitter = FixedSplitter(presplits)
      splits = data_splitter(records)
      assert splits == presplits
  
file_path: icevision/tests/data/test_record_collection.py
imports: import pytest
  from icevision.all import *
label_desc: Use image node_id 4 for calling a global function with example usage: test_fixed_splitter(records) without return types