Add comprehensive tests for package caching mechanism (PR #557 / Issue #521)

[Copilot]

Test Plan for Package Caching Validation (PR #557 / Issue #521)

Understanding the Issue ✅

• Analyze existing caching mechanism in scylla_repository.py
• Review get_url_hash() implementation for local files, S3, and HTTP
• Understand the hash validation logic (lines 337-361 in scylla_repository.py)

Unit Tests Created ✅

• Test get_url_hash() for local files (7 tests)
• Test get_url_hash() for HTTP URLs (mocked)
• Test get_url_hash() for S3 URLs (mocked)
• Test save_source_file() and get_installed_scylla_package_hash() (4 tests)
• Test hash comparison logic (2 tests)
• Test edge cases (4 tests - corrupted files, special characters, md5sum failures)

Integration Tests Created ✅

• Test local file hash caching (validates issue Improve caching of local tarballs #521 fix)
• Test local file hash change detection
• Test setup() with environment variable local package
• All tests added to test_caching_hash.py and test_scylla_repository.py

Test Execution Results ✅

• All 22 new tests passing (3 skipped as expected)
• All 53 existing unit tests still passing
• Tests cover local files, S3, and HTTP download scenarios
• Documentation added (CACHING_TESTS_README.md)
• Unused imports removed from test_caching_hash.py

Test Files Created

• tests/test_caching_hash.py (new, 365 lines)

  • TestGetUrlHash (7 tests)
  • TestSourceFileOperations (4 tests)
  • TestCachingIntegration (2 tests)
  • TestScyllaSetupCaching (2 tests)
  • TestRealDownloadCaching (3 tests, skipped)
  • TestCachingEdgeCases (4 tests)

• tests/test_scylla_repository.py (modified)

  • TestLocalFileCaching (3 integration tests)

• tests/CACHING_TESTS_README.md (new)

  • Complete documentation of test coverage
  • Execution instructions
  • Troubleshooting guide

Validation Complete ✅

The tests comprehensively validate that PR #557 fixes issue #521 by:

1. ✅ Testing hash calculation for local files via md5sum
2. ✅ Testing hash storage in source.txt files
3. ✅ Testing hash retrieval and comparison
4. ✅ Testing cache invalidation on hash mismatch
5. ✅ Testing all three download types (local, S3, HTTP)

Original prompt

create unit test an intgration test to validate #557 base on report from #521 (comment) that the caching isn't working as expected with local files (check also download from s3 and from http)

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[fruch]

@copilot

fix review comments about unused imports

[Copilot]

@copilot

fix review comments about unused imports

Fixed in commit 5805780. Removed unused imports from test_caching_hash.py:

• tempfile (not used)
• time (not used)
• Mock (only MagicMock is used)
• requests (only used in @patch decorator as string)

All 22 tests still pass.