Improve Regression Testing for Cross-Platform Compatibility

[DonHugo]

🧪 Regression Testing Improvements

📋 Issue Description

The current regression testing suite has some issues when running on macOS instead of the target Raspberry Pi environment. While the architecture validation is successful (93.8% success rate), the tests need improvements for better cross-platform compatibility.

🔍 Current Issues

1. Environment-specific failures: Tests fail on macOS due to missing Linux-specific services (nginx, systemd, mosquitto)
2. API endpoint URL construction: Some tests still have double '/api/api/' in URLs
3. Test environment assumptions: Tests assume services are running locally

✅ Already Fixed

• HTML API reference: ✅ Fixed (now contains '/api/status')
• Basic regression test endpoints: ✅ Fixed

🎯 Proposed Solutions

1. Environment Detection

import platform
import os

def is_raspberry_pi():
    """Detect if running on Raspberry Pi"""
    try:
        with open('/proc/cpuinfo', 'r') as f:
            return 'Raspberry Pi' in f.read()
    except:
        return False

def should_skip_service_tests():
    """Skip service tests on non-Linux systems"""
    return platform.system() != 'Linux' or not is_raspberry_pi()

2. Mock Services for Testing

class MockServiceTester:
    """Mock service responses for testing"""
    def test_nginx_mock(self):
        # Mock nginx response
        pass
    
    def test_api_server_mock(self):
        # Mock API server response
        pass

3. Conditional Test Execution

@pytest.mark.skipif(not is_raspberry_pi(), reason="Requires Raspberry Pi environment")
def test_systemd_services(self):
    # Only run on actual Raspberry Pi
    pass

📊 Current Test Results

• Total Tests: 40
• Passed: 26 ✅ (65% raw, 93.8% architecture validation)
• Failed: 14 ❌ (mostly environment-related)
• Architecture Validation: ✅ SUCCESSFUL

🎯 Success Criteria

• Tests pass on macOS (development environment)
• Tests pass on Raspberry Pi (production environment)
• Clear separation between environment and architecture tests
• Better test reporting and categorization

📁 Files to Update

• python/v3/tests/test_regression_comprehensive.py
• python/v3/tests/test_regression_comprehensive_fixed.py
• Add new test utilities for cross-platform compatibility

📋 Priority

Medium - Architecture is sound, but testing experience could be improved for developers working on macOS.

🎯 Acceptance Criteria

• Regression tests pass on macOS
• Clear distinction between environment and architecture failures
• Better test reporting with environment context
• Documentation for running tests in different environments