new_contents: import mock
  
  from pyshark.tshark.tshark import (
      get_tshark_display_filter_flag,
      get_tshark_interfaces,
      get_tshark_version,
  )
  
  @mock.patch('pyshark.tshark.tshark.subprocess.check_output', autospec=True)
  def test_get_tshark_version(mock_check_output):
      mock_check_output.return_value = (
          b'TShark 1.12.1 (Git Rev Unknown from unknown)\n\n'b'Copyright '
          b'1998-2014 Gerald Combs <gerald@wireshark.org> and contributors.\n'
      )
      actual = get_tshark_version()
      expected = '1.12.1'
      assert actual == expected
  
  @mock.patch('pyshark.tshark.tshark.get_tshark_version', autospec=True)
  def test_get_display_filter_flag(mock_get_tshark_version):
      mock_get_tshark_version.return_value = '1.10.0'
      actual = get_tshark_display_filter_flag()
      expected = '-Y'
      assert actual == expected
  
      mock_get_tshark_version.return_value = '1.6.0'
      actual = get_tshark_display_filter_flag()
      expected = '-R'
      assert actual == expected
  
  @mock.patch('pyshark.tshark.tshark.subprocess.check_output', autospec=True)
  def test_get_tshark_interfaces(mock_check_output):
      mock_check_output.return_value = (
          b'1. wlan0\n2. any\n3. lo (Loopback)\n4. eth0\n5. docker0\n'
      )
      actual = get_tshark_interfaces()
      expected = ['1', '2', '3', '4', '5']
      assert actual == expected
  
  
subject: Add tests for tshark sub-module