text: # Copyright (c) 2019 by Dario Lombardo <lomato@gmail.com>
  #
  # SPDX-License-Identifier: GPL-2.0-or-later
  
  import unittest
  import fixtures
  from suite_dfilter.dfiltertest import *
  
  @fixtures.uses_fixtures
  class case_dfunction_string(unittest.TestCase):
      trace_file = "dhcp.pcap"
  
      def test_matches_1(self, checkDFilterCount):
          dfilter = "string(frame.number) matches \"[13579]$\""
          checkDFilterCount(dfilter, 2)
  
      def test_contains_1(self, checkDFilterCount):
          dfilter = "string(eth.src) contains \"00:08:74\""
          checkDFilterCount(dfilter, 2)
  
      def test_fail_1(self, checkDFilterFail):
          # Invalid filter (only non-string fields are supported)
          dfilter = "string(dhcp.server) == hostname"
          error = 'To string conversion for this field is not supported'
          checkDFilterFail(dfilter, error)
  
      def test_fail_2(self, checkDFilterFail):
          # Invalid field: value
          dfilter = "string(123) == \"123\""
          error = 'To string conversion for this field is not supported'
          checkDFilterFail(dfilter, error)
  
      def test_fail_3(self, checkDFilterFail):
          # Invalid field: protocol
          dfilter = "string(dhcp) == hostname"
          error = 'To string conversion for this field is not supported'
          checkDFilterFail(dfilter, error)
  
      def test_fail_4(self, checkDFilterFail):
          # Invalid field: bytes
          dfilter = "string(dhcp.option.value) == \"hostname\""
          error = 'To string conversion for this field is not supported'
          checkDFilterFail(dfilter, error)
  