text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  """Tests for the filter file CLI arguments helper."""
  
  import argparse
  import unittest
  
  from plaso.cli import tools
  from plaso.cli.helpers import filter_file
  from plaso.lib import errors
  
  from tests.cli import test_lib as cli_test_lib
  
  
  class FilterFileArgumentsHelperTest(cli_test_lib.CLIToolTestCase):
    """Tests for the filter file CLI arguments helper."""
  
    # pylint: disable=no-member,protected-access
  
    _EXPECTED_OUTPUT = """\
  usage: cli_helper.py [-f FILE_FILTER]
  
  Test argument parser.
  
  {0:s}:
    -f FILE_FILTER, --filter-file FILE_FILTER, --filter_file FILE_FILTER, --file-filter FILE_FILTER, --file_filter FILE_FILTER
                          List of files to include for targeted collection of
                          files to parse, one line per file path, setup is
                          /path|file - where each element can contain either a
                          variable set in the preprocessing stage or a regular
                          expression.
  """.format(cli_test_lib.ARGPARSE_OPTIONS)
  
    def testAddArguments(self):
      """Tests the AddArguments function."""
      argument_parser = argparse.ArgumentParser(
          prog='cli_helper.py', description='Test argument parser.',
          add_help=False,
          formatter_class=cli_test_lib.SortedArgumentsHelpFormatter)
  
      filter_file.FilterFileArgumentsHelper.AddArguments(argument_parser)
  
      output = self._RunArgparseFormatHelp(argument_parser)
      self.assertEqual(output, self._EXPECTED_OUTPUT)
  
    def testParseOptions(self):
      """Tests the ParseOptions function."""
      options = cli_test_lib.TestOptions()
      options.file_filter = self._GetTestFilePath(['testdir', 'filter2.txt'])
  
      test_tool = tools.CLITool()
      filter_file.FilterFileArgumentsHelper.ParseOptions(options, test_tool)
  
      self.assertEqual(test_tool._filter_file, options.file_filter)
  
      with self.assertRaises(errors.BadConfigObject):
        filter_file.FilterFileArgumentsHelper.ParseOptions(options, None)
  
      # TODO: improve test coverage.
  
  
  if __name__ == '__main__':
    unittest.main()
  