new_contents: import os
  import re
  import sys
  import pytest
  from mock import Mock, mock_open, patch
  app_path = os.path.dirname(os.path.abspath(__file__))
  sys.path.insert(0, app_path + '/../')
  
  from photo_rename import *
  from stubs import *
  
  @pytest.fixture
  def alt_file_map_tab():
      """
      Sample alternate file map.
      """
      return """
  abc 123	MY NEW FILE 1
  xyz 999	MY NEW FILE 2
      """
  
  @pytest.fixture
  def alt_file_map_xxx():
      """
      Sample alternate file map.
      """
      return """
  abc 123xxxMY NEW FILE 1
  xyz 999xxxMY NEW FILE 2
      """
  
  @pytest.fixture
  def alt_file_map_dict():
      """
      Sample alternate file map converted to dict.
      """
      return {"abc 123": "MY NEW FILE 1", "xyz 999": "MY NEW FILE 2"}
  
  class TestFilemapReadAltFilemap(object):
      """
      Tests reading alternate file map.
      """
  
      @pytest.mark.skipif(RUN_TEST, reason="Work in progress")
      def test_read_alt_file_map(self, alt_file_map_tab, alt_file_map_dict):
          """
          Read alt file map and create dict with default delimiter `\t'.
          """
          a = mock_open(read_data=alt_file_map_tab.strip())
          with patch('builtins.open', a) as m:
              afmd = read_alt_file_map("foo")
              assert afmd == alt_file_map_dict
  
      @pytest.mark.skipif(RUN_TEST, reason="Work in progress")
      def test_read_alt_file_map(self, alt_file_map_xxx, alt_file_map_dict):
          """
          Read alt file map and create dict with custom delimiter `xxx'.
          """
          a = mock_open(read_data=alt_file_map_xxx.strip())
          with patch('builtins.open', a) as m:
              afmd = read_alt_file_map("foo", delimiter="xxx")
              assert afmd == alt_file_map_dict
  
  
subject: Add new unit tests for reading alternate file map.