create python tests using moto for s3 bucket interactions

[ThaiTechTales]

Summary

Implement unit and integration tests for S3 bucket interactions using the moto library. This allows testing without accessing real AWS infrastructure.

Goals

• Provide test coverage for S3 logic using mocked AWS services
• Validate error handling and edge cases
• Integrate test suite with GitHub Actions CI pipeline

Tasks

• Set up pytest as the test runner
• Create unit tests using moto to mock S3 operations (put_object, get_object, etc.)
• Add test cases for failure scenarios (e.g., non-existent bucket, access denied)
• Configure test coverage reporting with coverage
• Add GitHub Actions workflow to run tests and generate reports on pull requests

Notes

• Use Python 3.12 environment
• Place tests in the tests/ directory using test_*.py naming
• Reference: moto documentation