Lib/test/test_binhex.py

"""Test script for the binhex C module

   Uses the mechanism of the python binhex module
   Based on an original test by Roger E. Masse.
"""
import unittest
from test import support
from test.support import import_helper
from test.support import os_helper
from test.support import warnings_helper


with warnings_helper.check_warnings(('', DeprecationWarning)):
    binhex = import_helper.import_fresh_module('binhex')


class BinHexTestCase(unittest.TestCase):

    def setUp(self):
        # binhex supports only file names encodable to Latin1
        self.fname1 = os_helper.TESTFN_ASCII + "1"
        self.fname2 = os_helper.TESTFN_ASCII + "2"
        self.fname3 = os_helper.TESTFN_ASCII + "very_long_filename__very_long_filename__very_long_filename__very_long_filename__"

    def tearDown(self):
        os_helper.unlink(self.fname1)
        os_helper.unlink(self.fname2)
        os_helper.unlink(self.fname3)

    DATA = b'Jack is my hero'

    def test_binhex(self):
        with open(self.fname1, 'wb') as f:
            f.write(self.DATA)

        binhex.binhex(self.fname1, self.fname2)

        binhex.hexbin(self.fname2, self.fname1)

        with open(self.fname1, 'rb') as f:
            finish = f.readline()

        self.assertEqual(self.DATA, finish)

    def test_binhex_error_on_long_filename(self):
        """
        The testcase fails if no exception is raised when a filename parameter provided to binhex.binhex()
        is too long, or if the exception raised in binhex.binhex() is not an instance of binhex.Error.
        """
        f3 = open(self.fname3, 'wb')
        f3.close()

        self.assertRaises(binhex.Error, binhex.binhex, self.fname3, self.fname2)

    def test_binhex_line_endings(self):
        # bpo-29566: Ensure the line endings are those for macOS 9
        with open(self.fname1, 'wb') as f:
            f.write(self.DATA)

        binhex.binhex(self.fname1, self.fname2)

        with open(self.fname2, 'rb') as fp:
            contents = fp.read()

        self.assertNotIn(b'\n', contents)

def test_main():
    support.run_unittest(BinHexTestCase)


if __name__ == "__main__":
    test_main()