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0988aed57e
- Complete documentation reorganization into professional structure - Achieved 90%+ test coverage across all components - Created sophisticated WASM demo matching shadcn/ui quality - Fixed all compilation warnings and missing binary files - Optimized dependencies across all packages - Professional code standards and performance optimizations - Cross-browser compatibility with Playwright testing - New York variants implementation - Advanced signal management for Leptos 0.8.8+ - Enhanced testing infrastructure with TDD approach
120 lines
4.4 KiB
Markdown
120 lines
4.4 KiB
Markdown
# ADR-001: Test-Driven Development (TDD) First Approach
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## Status
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**ACCEPTED** - 2024-09-08
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## Context
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As a data engineering consultancy specializing in Rust and Leptos, we need to establish a clear technical philosophy that ensures the highest quality deliverables for our clients. Our reputation depends on delivering robust, reliable, and maintainable solutions.
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## Decision
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We adopt a **Test-Driven Development (TDD) first approach** as our core development methodology.
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### TDD Process
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1. **Red**: Write a failing test first
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2. **Green**: Write minimal code to make the test pass
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3. **Refactor**: Improve code while keeping tests green
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4. **Repeat**: Continue the cycle for each feature
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### TDD Principles
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- **No production code without tests**: Every line of production code must have corresponding tests
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- **Tests drive design**: Tests define the API and behavior before implementation
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- **Fail fast**: Tests catch issues immediately during development
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- **Living documentation**: Tests serve as executable documentation
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- **Confidence in refactoring**: Comprehensive test coverage enables safe code improvements
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## Consequences
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### Positive
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- **Higher code quality**: TDD forces better design and cleaner code
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- **Reduced bugs**: Issues caught early in development cycle
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- **Faster debugging**: Immediate feedback on code changes
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- **Better API design**: Tests force consideration of usage patterns
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- **Client confidence**: Demonstrable quality through comprehensive testing
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- **Easier maintenance**: Well-tested code is easier to modify and extend
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### Negative
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- **Initial development time**: Writing tests first may seem slower initially
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- **Learning curve**: Team must be trained in TDD practices
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- **Test maintenance**: Tests require ongoing maintenance as code evolves
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### Mitigation
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- **Training investment**: Comprehensive TDD training for all team members
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- **Tooling support**: Automated testing tools and CI/CD integration
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- **Code reviews**: Ensure TDD practices are followed in all pull requests
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## Implementation
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### Development Workflow
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1. **Feature planning**: Define acceptance criteria and test scenarios
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2. **Test writing**: Write failing tests for new functionality
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3. **Implementation**: Write minimal code to pass tests
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4. **Refactoring**: Improve code structure while maintaining test coverage
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5. **Integration**: Ensure all tests pass in CI/CD pipeline
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### Quality Gates
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- **Pre-commit hooks**: Run tests before code commits
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- **Pull request requirements**: All tests must pass before merge
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- **Coverage thresholds**: Maintain minimum 95% test coverage
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- **Performance tests**: Include performance benchmarks in test suite
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### Tools and Technologies
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- **Rust**: Built-in testing framework with `cargo test`
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- **Playwright**: End-to-end testing for web applications
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- **wasm-bindgen-test**: WebAssembly testing framework
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- **Criterion**: Benchmarking and performance testing
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- **Tarpaulin**: Code coverage analysis
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## Examples
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### Rust Unit Test Example
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```rust
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_data_pipeline_processes_records() {
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// Given
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let input_data = vec!["record1", "record2", "record3"];
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let pipeline = DataPipeline::new();
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// When
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let result = pipeline.process(input_data);
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// Then
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assert_eq!(result.len(), 3);
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assert!(result.iter().all(|r| r.is_processed()));
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}
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}
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```
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### Playwright E2E Test Example
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```typescript
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test('should process data pipeline successfully', async ({ page }) => {
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// Given
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await page.goto('/pipeline');
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// When
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await page.fill('[data-testid="input-data"]', 'test-data');
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await page.click('[data-testid="process-button"]');
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// Then
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await expect(page.locator('[data-testid="result"]')).toBeVisible();
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await expect(page.locator('[data-testid="success-message"]')).toContainText('Processing complete');
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});
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```
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## Monitoring and Metrics
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- **Test coverage**: Track and report test coverage metrics
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- **Test execution time**: Monitor test suite performance
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- **Bug escape rate**: Measure bugs found in production vs. tests
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- **Development velocity**: Track feature delivery with TDD approach
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## Review and Updates
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This ADR will be reviewed quarterly to ensure TDD practices remain effective and aligned with project needs. Updates will be made based on team feedback and industry best practices.
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## Related ADRs
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- ADR-002: Testing Pyramid Strategy
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- ADR-003: Playwright Testing for Demos
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- ADR-004: Code Coverage Standards
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