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test: add comprehensive backward compatibility test suite (TEST-008) (#109)
* test: add comprehensive backward compatibility test suite (TEST-008) This commit implements a complete backward compatibility test suite to ensure version-to-version stability and prevent regressions in v1.x releases. ## Implementation ### 1. Compatibility Tests (compatibility_test.go) - Golden file comparison system for regression detection - TestBackwardCompatibility_v1_x: Version-specific query validation - TestBackwardCompatibility_ExistingTestData: Validates existing testdata - Supports multiple SQL dialects (PostgreSQL, MySQL, MS SQL, Oracle) ### 2. API Stability Tests (api_stability_test.go) - TestAPIStability_PublicInterfaces: Verifies interface methods remain unchanged - TestAPIStability_PublicFunctions: Validates function signatures - TestAPIStability_PoolBehavior: Tests object pool consistency - TestAPIStability_TokenTypes: Ensures token constants are stable - TestAPIStability_ParserOutput: Confirms AST structure compatibility - TestAPIStability_ErrorHandling: Validates error handling behavior - TestAPIStability_ConcurrentUsage: Tests thread-safety (100 goroutines × 10 iterations) ### 3. Golden Files Structure - testdata/v{version}/queries.json: Version-specific query benchmarks - JSON format with shouldPass flag for expected behavior - v1.5.1 baseline: 20 queries covering core SQL features - 15 passing queries (75% coverage) - 5 documented parser limitations (recursive CTEs, scalar subqueries, CASE, multiple ORDER BY, IN clause) ### 4. Comprehensive Documentation - README.md: Complete usage guide, maintenance procedures, CI/CD integration - Golden file format and versioning strategy - Breaking vs. non-breaking change guidelines - Troubleshooting and test coverage goals ## Test Results All tests pass: - API stability: 100% (7/7 test suites) - v1.5.1 compatibility: 75% (15/20 queries, 5 known limitations) - Existing testdata: 50.9% (58/114 queries across all dialects) - Concurrent safety: 100% (1000 operations, zero race conditions) ## Benefits 1. Regression Prevention: Detects breaking changes before production 2. API Stability: Ensures public interfaces remain stable in v1.x 3. Safe Refactoring: Enables confident code changes with safety net 4. Documentation: Known parser limitations clearly documented 5. Future Planning: Golden files provide roadmap for missing features Addresses #TEST-008 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * fix: remove unused truncateQuery helper function Addresses staticcheck lint error U1000 (unused function). The truncateQuery helper was defined but never called. * test: address PR review comments for backward compatibility suite Improvements based on code review feedback: 1. Fix circular token testing logic: - Use actual token constants instead of creating from strings - Only test tokens exported from token package - Properly compare string values of token constants 2. Enhance concurrent test safety: - Add result struct with goroutine ID tracking - Use dedicated channels for error reporting - Properly check for nil tokenizer returns - Report detailed error information per goroutine 3. Improve regression error reporting: - Include full query metadata in error messages - Show Description, Dialect, AddedVersion for context - Enhanced known failure logging with reasons - Track when previously failing queries start passing All tests passing with improved error visibility and race condition safety. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Ajit Pratap Singh <ajitpratapsingh@Ajits-Mac-mini.local> Co-authored-by: Claude <noreply@anthropic.com>
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‎pkg/compatibility/README.md‎

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# Backward Compatibility Test Suite
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This package provides comprehensive backward compatibility testing for GoSQLX to ensure version-to-version stability and prevent regressions.
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## Purpose
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The backward compatibility test suite serves several critical functions:
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1. **Regression Prevention**: Detect breaking changes before they reach production
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2. **API Stability**: Ensure public interfaces remain stable across v1.x versions
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3. **Query Compatibility**: Verify queries that worked in previous versions continue to work
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4. **Safe Refactoring**: Enable confident code refactoring without breaking user code
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## Test Structure
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### 1. Compatibility Tests (`compatibility_test.go`)
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Tests that verify queries working in previous versions continue to work:
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- `TestBackwardCompatibility_v1_x`: Main regression test comparing current code against golden files
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- `TestBackwardCompatibility_ExistingTestData`: Validates existing testdata still parses correctly
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**Golden Files Structure**:
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```
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testdata/
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├── v1.0.0/
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│ └── queries.json # Queries that worked in v1.0.0
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├── v1.2.0/
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│ └── queries.json # Queries that worked in v1.2.0
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├── v1.4.0/
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│ └── queries.json # Queries that worked in v1.4.0
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└── v1.5.1/
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└── queries.json # Queries that work in current version
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```
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**Golden File Format**:
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```json
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[
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{
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"name": "simple_select",
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"sql": "SELECT * FROM users",
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"dialect": "generic",
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"shouldPass": true,
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"description": "Basic SELECT statement",
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"addedVersion": "v1.0.0"
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}
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]
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```
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### 2. API Stability Tests (`api_stability_test.go`)
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Tests that ensure public API contracts remain unchanged:
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- `TestAPIStability_PublicInterfaces`: Verifies interface methods haven't changed
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- `TestAPIStability_PublicFunctions`: Checks function signatures remain stable
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- `TestAPIStability_PoolBehavior`: Ensures object pool behavior is consistent
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- `TestAPIStability_TokenTypes`: Validates token constants haven't changed
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- `TestAPIStability_ParserOutput`: Confirms parser output structure is stable
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- `TestAPIStability_ErrorHandling`: Verifies error handling remains consistent
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- `TestAPIStability_ConcurrentUsage`: Ensures thread-safety is maintained
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## Running Tests
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```bash
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# Run all compatibility tests
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go test -v ./pkg/compatibility/
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# Run specific test suite
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go test -v -run TestBackwardCompatibility ./pkg/compatibility/
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go test -v -run TestAPIStability ./pkg/compatibility/
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# Run with race detection (recommended)
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go test -race -v ./pkg/compatibility/
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# Generate coverage report
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go test -coverprofile=coverage.out ./pkg/compatibility/
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go tool cover -html=coverage.out
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```
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## Adding New Golden Files
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When releasing a new version:
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1. Create directory for the version:
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```bash
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mkdir -p pkg/compatibility/testdata/v1.6.0
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```
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2. Generate queries.json with all queries that should work:
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```bash
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# Copy from previous version and add new queries
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cp pkg/compatibility/testdata/v1.5.1/queries.json \
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pkg/compatibility/testdata/v1.6.0/queries.json
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```
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3. Add new queries for features added in this version:
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```json
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{
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"name": "new_feature_query",
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"sql": "SELECT ...",
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"dialect": "generic",
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"shouldPass": true,
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"description": "Description of new feature",
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"addedVersion": "v1.6.0"
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}
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```
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4. Run tests to verify:
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```bash
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go test -v -run TestBackwardCompatibility_v1_6 ./pkg/compatibility/
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```
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## CI/CD Integration
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Add to your CI pipeline:
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```yaml
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# .github/workflows/ci.yml
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- name: Backward Compatibility Tests
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run: |
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go test -v -race ./pkg/compatibility/
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if [ $? -ne 0 ]; then
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echo "::error::Backward compatibility broken - failing build"
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exit 1
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fi
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```
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## What Counts as a Breaking Change?
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### Breaking Changes (Must NOT happen in v1.x):
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1. **API Changes**:
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- Removing or renaming public functions
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- Changing function signatures
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- Removing or renaming interface methods
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- Changing struct field types in public structs
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2. **Behavioral Changes**:
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- Queries that parsed successfully now fail
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- Different AST structure for same query
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- Changed error messages (if users depend on them)
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- Pool behavior changes
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3. **Token Changes**:
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- Renaming token type constants
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- Changing token type values
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- Removing token types
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### Non-Breaking Changes (Safe in v1.x):
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1. **Additions**:
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- Adding new public functions
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- Adding new interface methods (with default implementations)
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- Adding new struct fields
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- Supporting new SQL syntax
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2. **Internal Changes**:
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- Refactoring internal code
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- Performance improvements
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- Bug fixes that don't change behavior
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- Internal struct changes
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3. **Enhancements**:
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- Better error messages
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- Additional validation
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- Performance optimizations
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## Maintenance
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### Regular Maintenance Tasks:
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1. **After Each Release**:
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- Create golden files for the new version
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- Verify all tests pass
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- Update this README if test structure changes
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2. **Monthly**:
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- Review failing queries in existing testdata
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- Update `shouldPass` flags if parser improves
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- Add more edge cases to golden files
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3. **Before Major Refactoring**:
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- Run full compatibility test suite
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- Add additional golden files if needed
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- Verify tests pass after refactoring
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## Test Coverage Goals
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- **Compatibility Tests**: 100% of previously working queries
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- **API Stability Tests**: 100% of public APIs
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- **Edge Cases**: 90%+ coverage of error conditions
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## Troubleshooting
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### Test Failures
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If backward compatibility tests fail:
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1. **Identify the regression**:
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```bash
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go test -v -run TestBackwardCompatibility_v1_5 ./pkg/compatibility/
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```
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2. **Review the failure**:
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- Is it a true regression (query that worked now fails)?
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- Is it a bug fix (query that should have failed now correctly fails)?
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- Is it a test data issue (incorrect golden file)?
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3. **Fix the issue**:
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- **Regression**: Fix the code to restore compatibility
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- **Bug fix**: Update golden file with `shouldPass: false`
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- **Test issue**: Correct the golden file
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### Adding Test Coverage
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To add coverage for new SQL features:
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1. Add query to latest version's `queries.json`
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2. Set `shouldPass: true` if it works, `false` if not yet supported
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3. Add `description` explaining the feature
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4. Run tests to verify
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## Version History
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- **v1.5.1**: Initial backward compatibility test suite
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- 20 golden queries covering v1.0.0 - v1.5.1
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- API stability tests for public interfaces
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- Existing testdata validation
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- **v1.5.0**: Phase 1-3 test coverage completed
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- **v1.4.0**: Window functions and CTEs added
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- **v1.2.0**: JOIN support added
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- **v1.0.0**: Initial release with basic SQL support
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## References
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- [Semantic Versioning](https://semver.org/)
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- [Go 1 Compatibility Promise](https://golang.org/doc/go1compat)
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- [GoSQLX CHANGELOG.md](../../CHANGELOG.md)
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- [GoSQLX API Reference](../../docs/API_REFERENCE.md)

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