Enhance Test Coverage with Pytest

[ABHISHEKSONI121]

Enhanced Test Coverage and Added New Test Suites

This PR significantly improves the test coverage of the pyafipws project by enhancing existing test suites and adding new ones.

Enhancements to Existing Test Suites

1. test_pyemail.py

• Expanded test cases for email functionality
• Improved assertions and edge case handling
• Coverage increased from 76% to 89%

2. test_pyi25.py

• Added more comprehensive tests for I25 barcode generation
• Increased coverage of various input scenarios
• Coverage improved from 82% to 86%

3. test_ws_sr_padron.py

• Enhanced tests for web service interactions with AFIP's taxpayer registry
• Improved mocking and response handling
• Coverage boosted from 69% to 80%

4. test_wsaa.py

• Strengthened authentication and authorization testing
• Added more scenarios for token generation and validation
• Coverage enhanced from 66% to 77%

New Test Suites

5. test_cot.py

• Implemented a new test suite for COT (Código de Operación de Traslado) functionality
• Covers various aspects of COT generation and validation
• Achieved initial coverage of 74%

6. test_recex1.py

• Created a new test suite for RECEX (Remito Electrónico Cárnico) functionality
• Includes tests for document generation, validation, and processing
• Established initial coverage of 82%

Test Coverage Improvements

Test Module	Original Coverage	New Coverage	Improvement
test_pyemail.py	76%	89%	+13%
test_pyi25.py	82%	86%	+4%
test_ws_sr_padron.py	69%	80%	+11%
test_wsaa.py	66%	77%	+11%
test_cot.py	N/A (New)	74%	+74%
test_recex1.py	N/A (New)	82%	+82%

Test Suite Outputs

test_pyemail.py	test_pyi25.py
test_ws_sr_padron.py	test_wsaa.py
test_cot.py	test_recex1.py