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Testing Cookie Management Implementation in youtube-dl

This test suite validates the YoutubeDLCookieJar functionality in youtube-dl, focusing on cookie handling, session management, and HTTP header processing. The tests ensure proper cookie parsing, storage, and retrieval across different scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of cookie jar functionality:

Session cookie persistence and storage
HTTPOnly cookie prefix handling
Malformed cookie file processing
Cookie header generation
URL-specific cookie retrieval

Edge cases include malformed cookie files and session cookie expiration handling.

Implementation Analysis

The testing approach uses Python’s unittest framework with isolated test cases for each cookie handling feature. The implementation follows a systematic pattern of setting up cookie scenarios, performing operations, and verifying results through assertions.

Key patterns include temporary file handling for cookie storage, regex-based content verification, and domain-specific cookie validation.

Technical Details

Testing tools and configuration:

Python unittest framework
Temporary file management via tempfile
Custom YoutubeDLCookieJar implementation
Test data files for various cookie scenarios
Regular expressions for content validation

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Proper resource cleanup using try/finally blocks
Isolation of test cases
Comprehensive assertion usage
Test data separation
Clear test method naming conventions

Code organization follows standard unittest patterns with setup and teardown considerations.

ytdl-org/youtube-dl

test/test_YoutubeDLCookieJar.py

            
#!/usr/bin/env python
# coding: utf-8

from __future__ import unicode_literals

import os
import re
import sys
import tempfile
import unittest
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from youtube_dl.utils import YoutubeDLCookieJar


class TestYoutubeDLCookieJar(unittest.TestCase):
    def test_keep_session_cookies(self):
        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/session_cookies.txt')
        cookiejar.load(ignore_discard=True, ignore_expires=True)
        tf = tempfile.NamedTemporaryFile(delete=False)
        try:
            cookiejar.save(filename=tf.name, ignore_discard=True, ignore_expires=True)
            temp = tf.read().decode('utf-8')
            self.assertTrue(re.search(
                r'www\.foobar\.foobar\s+FALSE\s+/\s+TRUE\s+0\s+YoutubeDLExpiresEmpty\s+YoutubeDLExpiresEmptyValue', temp))
            self.assertTrue(re.search(
                r'www\.foobar\.foobar\s+FALSE\s+/\s+TRUE\s+0\s+YoutubeDLExpires0\s+YoutubeDLExpires0Value', temp))
        finally:
            tf.close()
            os.remove(tf.name)

    def test_strip_httponly_prefix(self):
        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/httponly_cookies.txt')
        cookiejar.load(ignore_discard=True, ignore_expires=True)

        def assert_cookie_has_value(key):
            self.assertEqual(cookiejar._cookies['www.foobar.foobar']['/'][key].value, key + '_VALUE')

        assert_cookie_has_value('HTTPONLY_COOKIE')
        assert_cookie_has_value('JS_ACCESSIBLE_COOKIE')

    def test_malformed_cookies(self):
        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/malformed_cookies.txt')
        cookiejar.load(ignore_discard=True, ignore_expires=True)
        # Cookies should be empty since all malformed cookie file entries
        # will be ignored
        self.assertFalse(cookiejar._cookies)

    def test_get_cookie_header(self):
        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/httponly_cookies.txt')
        cookiejar.load(ignore_discard=True, ignore_expires=True)
        header = cookiejar.get_cookie_header('https://www.foobar.foobar')
        self.assertIn('HTTPONLY_COOKIE', header)

    def test_get_cookies_for_url(self):
        cookiejar = YoutubeDLCookieJar('./test/testdata/cookies/session_cookies.txt')
        cookiejar.load(ignore_discard=True, ignore_expires=True)
        cookies = cookiejar.get_cookies_for_url('https://www.foobar.foobar/')
        self.assertEqual(len(cookies), 2)
        cookies = cookiejar.get_cookies_for_url('https://foobar.foobar/')
        self.assertFalse(cookies)


if __name__ == '__main__':
    unittest.main()