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Testing Metadata Title Pattern Processing in youtube-dl

This test suite validates the MetadataFromTitlePP post-processor functionality in youtube-dl, focusing on metadata extraction from video titles. The tests verify the correct parsing of title formats and conversion of format strings to regular expressions for metadata extraction.

Test Coverage Overview

The test suite covers the core functionality of the MetadataFromTitlePP post-processor, specifically focusing on format string to regex conversion.

Tests the format_to_regex conversion method
Validates pattern matching for title and artist metadata extraction
Ensures correct handling of format string patterns

Implementation Analysis

The implementation uses Python’s unittest framework with a focused approach on testing the metadata extraction logic. The tests employ pattern matching verification using regular expressions, with specific attention to the transformation of format strings into regex patterns.

Key patterns include:

Direct regex pattern validation
Format string conversion testing
Assertion-based verification of regex patterns

Technical Details

Testing tools and configuration:

Python unittest framework
MetadataFromTitlePP post-processor class
Custom path configuration for test execution
Direct test file execution support

Best Practices Demonstrated

The test implementation showcases several testing best practices in Python unit testing. It demonstrates clean test organization with proper test case isolation and clear assertion statements.

Isolated test case structure
Clear test method naming
Proper test setup and configuration
Direct test execution capability

ytdl-org/youtube-dl

test/test_postprocessors.py

            
#!/usr/bin/env python

from __future__ import unicode_literals

# Allow direct execution
import os
import sys
import unittest
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from youtube_dl.postprocessor import MetadataFromTitlePP


class TestMetadataFromTitle(unittest.TestCase):
    def test_format_to_regex(self):
        pp = MetadataFromTitlePP(None, '%(title)s - %(artist)s')
        self.assertEqual(pp._titleregex, r'(?P<title>.+)\ \-\ (?P<artist>.+)')