old_contents: from tsstats.client import Clients
  
  ident_map = {
      '1': '2',
      '5': '2',
      'UID1': 'UID2',
      'UID5': 'UID2'
  }
  clients = Clients(ident_map)
  
  
  def test_get_id():
      assert clients['1'].identifier == '2'
      assert clients['5'].identifier == '2'
  
  
  def test_get_uid():
      assert clients['UID1'].identifier == 'UID2'
      assert clients['UID5'].identifier == 'UID2'
  
new_contents: from tsstats.client import Client, Clients
  
  ident_map = {
      '1': '2',
      '5': '2',
      'UID1': 'UID2',
      'UID5': 'UID2'
  }
  clients = Clients(ident_map)
  cl = Client('2', 'Client2')
  uidcl = Client('UID2', 'Client2++')
  clients += cl
  clients += uidcl
  
  
  def test_ident_map():
      assert clients['1'] == cl
      assert clients['5'] == cl
      assert clients['UID1'] == uidcl
      assert clients['UID5'] == uidcl
  
subject: test refactored tsstats.client.Clients correctly in test_ident_map.py