text: # Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import os
  
  try:
      import pynini
  
      PYNINI_AVAILABLE = True
  except (ImportError, ModuleNotFoundError):
      PYNINI_AVAILABLE = False
  
  
  def parse_test_case_file(file_name: str):
      """
      Prepares tests pairs for ITN and TN tests
      """
      test_pairs = []
      with open(os.path.dirname(os.path.abspath(__file__)) + os.path.sep + file_name, 'r') as f:
          for line in f:
              spoken, written = line.split('~')
              test_pairs.append((spoken, written.strip("\n")))
      return test_pairs
  
  
  def get_test_cases_multiple(file_name: str = 'data_text_normalization/test_cases_normalize_with_audio.txt'):
      """
      Prepares tests pairs for audio based TN tests
      """
      test_pairs = []
      with open(os.path.dirname(os.path.abspath(__file__)) + os.path.sep + file_name, 'r') as f:
          written = None
          normalized_options = []
          for line in f:
              if line.startswith('~'):
                  if written:
                      test_pairs.append((written, normalized_options))
                      normalized_options = []
                  written = line.strip().replace('~', '')
              else:
                  normalized_options.append(line.strip())
      test_pairs.append((written, normalized_options))
      return test_pairs
  