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Testing Cross-Platform Filename Handling in you-get

A comprehensive test suite for the you-get utility’s filesystem handling functions, focusing on filename legitimization across different operating systems. This test suite ensures consistent file naming behavior across Linux, Mac, Windows, and WSL environments.

Test Coverage Overview

The test suite provides targeted coverage of the legitimize() function in the filesystem utilities module.

Key areas tested include:

File name character handling across different OS platforms
Special character conversion for Windows compatibility
Consistent behavior between WSL and Windows environments
Preservation of valid characters on Unix-based systems

Implementation Analysis

The implementation uses Python’s unittest framework with a focused single test case class structure. The testing approach employs assertEqual assertions to verify string transformations across multiple operating system contexts, using parameterized inputs to validate platform-specific behavior.

Key patterns include:

Systematic OS-specific test cases
Direct string comparison assertions
Platform-aware test conditions

Technical Details

Testing infrastructure includes:

Python unittest framework
Custom filesystem utility module (you_get.util.fs)
TestUtil class extending unittest.TestCase
Platform-specific test parameters

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Python unit testing.

Notable practices include:

Isolated test cases for specific functionality
Clear test method naming conventions
Comprehensive platform coverage
Consistent assertion patterns
Focused test scope with single responsibility

soimort/you-get

tests/test_util.py

            
#!/usr/bin/env python

import unittest

from you_get.util.fs import *

class TestUtil(unittest.TestCase):
    def test_legitimize(self):
        self.assertEqual(legitimize("1*2", os="linux"), "1*2")
        self.assertEqual(legitimize("1*2", os="mac"), "1*2")
        self.assertEqual(legitimize("1*2", os="windows"), "1-2")
        self.assertEqual(legitimize("1*2", os="wsl"), "1-2")