Fix intermittent HTTP test failures by implementing mocking

[nissy0409240]

Fix intermittent HTTP test failures by implementing comprehensive mocking

🎯 Overview

This PR resolves Issue #513 by replacing unstable external HTTP requests in tests with reliable unittest.mock implementations, eliminating intermittent CI/CD failures and improving test suite stability.

🐛 Problem

HTTP tests were experiencing intermittent failures in CI/CD pipeline due to:

• Dependency on external service (Postman Echo API)
• Network connectivity issues
• Service availability fluctuations
• Unpredictable response times causing timeouts

Failed Tests: 13 HTTP tests across adapter and scenario modules were failing inconsistently.

🔧 Solution

1. Complete HTTP Test Mocking

• Adapter Tests (`cliboa/test/adapter/test_http.py`):

  • Mocked all 4 test classes: `TestDownload`, `TestUpload`, `TestUpdate`, `TestDelete`
  • Applied `@patch` decorators for `requests.get/post/put/delete`
  • Added both `.text` and `.content` attributes to mock responses

• Scenario Tests:

  • Extract (`cliboa/test/scenario/extract/test_http.py`): 3 test classes, 7 test methods
  • Load (`cliboa/test/scenario/load/test_http.py`): 3 test classes, 6 test methods
  • Fixed patch paths from module-specific to direct `requests.*` methods

2. HTTP Adapter Enhancement

• Error Handling Fix (`cliboa/adapter/http.py:67`):

  else:
      raise HTTPError("Http request failed after all retries.")

3. Test Assertion Updates

• Unified error message assertions across all HTTP tests
• Changed from specific status codes to generic "Http request failed" pattern
• Ensured consistency between adapter and scenario test behavior

🧪 Testing

• ✅ All 8 adapter HTTP tests passing
• ✅ All 13 scenario HTTP tests passing
• ✅ No external dependencies in test execution
• ✅ Consistent test results across environments

📊 Impact

• Test Reliability: Eliminated intermittent failures completely
• CI/CD Stability: Removed external service dependency
• Execution Speed: Reduced test runtime by eliminating network delays
• Coverage: Maintained test coverage while improving stability
• Code Quality: Applied consistent formatting (black, flake8, isort)

🔍 Code Quality

All modified files have been formatted using:

• black: Automatic code formatting (line length: 100)
• flake8: Static analysis and style guide enforcement
• isort: Import statement organization

📋 Files Modified

• cliboa/adapter/http.py - Enhanced error handling
• cliboa/test/adapter/test_http.py - Comprehensive mocking implementation
• cliboa/test/scenario/extract/test_http.py - Mock patches and assertions
• cliboa/test/scenario/load/test_http.py - Mock patches and assertions

✅ Verification

• All HTTP tests pass consistently
• No external network dependencies
• Code formatting standards applied
• Error handling edge cases covered
• Mock responses include all required attributes

Closes #513