Tests for formato_txt.py module

[ABHISHEKSONI121]

Test Suite Summary for formato_txt Module

Key Achievements

• 34 tests passing, 1 skipped
• Comprehensive testing for leer ,escribir, ayuda, leer_linea and escribir_linea functions and related functionality
• Covers TXT file reading, data extraction, and various input scenarios
• Includes edge cases and exception handling

Manual test evidence

Checklist

• Classes, Variables, function and methods logic ok
• Comments written explaining what the code does
• All python code is PEP8 compliant (run black .)
• No lint issues (run flake8)
• Test coverage with pytest implemented
• Reviewers assigned (at least 1 mentor)

🔗 Related Issues

Closes #163: Improve test coverage for formato_txt module

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💡 This test suite provides a solid foundation for the formato_txt module.