code: def mock_a_text_file(sample_lines, line_num, file_name):
      """Generate a mock text file for test."""
      with open(file_name, "w", encoding="utf-8") as f:
          lines = random_upsampling(sample_lines, line_num)
          for line in lines:
              f.write(line + "\n")
  
file_path: delta/delta/data/datasets/utils.py
imports: import os
  import pickle
  import numpy
  from pathlib import Path
  import tempfile
  from absl import logging
  from sklearn.model_selection import train_test_split
label_desc: Use image node_id 6 for calling a global function with example usage: mock_a_text_file(sample_lines, line_num, file_name) without return types