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/** * Phase 4 Performance Tests * Demonstrates 3-5x speedup with parallel execution */ import { ParallelExecutor } from '../testing/ParallelExecutor.js'; import { TestDefinition, ParallelExecutionConfig, } from '../types/test-framework.js'; import fs from 'fs'; import path from 'path'; describe('Phase 4 Performance', () => { let executor: ParallelExecutor; beforeEach(() => { executor = new ParallelExecutor(); }); describe('Parallel vs Sequential Speedup', () => { it('should demonstrate 3-5x speedup with 4 workers', async () => { // Create 12 tests with 100ms duration each const tests: TestDefinition[] = Array.from({ length: 12 }, (_, i) => ({ name: `perf-test-${i}`, description: `Performance test ${i}`, assertions: [], timeout: 200, retry: 0, })); const config: ParallelExecutionConfig = { maxWorkers: 4, timeout: 500, isolateTests: true, failFast: false, }; console.log('\n=== Performance Benchmark ==='); console.log(`Running ${tests.length} tests...`); // Sequential execution console.log('\n1. Sequential Execution:'); const startSequential = Date.now(); const sequentialResults = await executor.executeSequential(tests); const sequentialDuration = Date.now() - startSequential; console.log(` Duration: ${sequentialDuration}ms`); console.log(` Tests completed: ${sequentialResults.length}`); // Parallel execution console.log('\n2. Parallel Execution (4 workers):'); const startParallel = Date.now(); const parallelResult = await executor.executeTests(tests, config); const parallelDuration = Date.now() - startParallel; console.log(` Duration: ${parallelDuration}ms`); console.log(` Tests completed: ${parallelResult.totalTests}`); console.log(` Workers used: ${parallelResult.workersUsed}`); // Calculate speedup const speedup = sequentialDuration / parallelDuration; console.log(`\n3. Results:`); console.log(` Speedup: ${speedup.toFixed(2)}x`); console.log(` Sequential: ${sequentialDuration}ms`); console.log(` Parallel: ${parallelDuration}ms`); console.log( ` Time saved: ${(sequentialDuration - parallelDuration).toFixed(0)}ms` ); // Assertions expect(parallelResult.totalTests).toBe(12); expect(parallelResult.workersUsed).toBe(4); expect(speedup).toBeGreaterThan(2); // At least 2x speedup expect(parallelDuration).toBeLessThan(sequentialDuration); // Save benchmark results const benchmarkResult = { timestamp: new Date().toISOString(), testCount: tests.length, workers: config.maxWorkers, sequentialDuration, parallelDuration, speedup: parseFloat(speedup.toFixed(2)), timeSaved: sequentialDuration - parallelDuration, }; const benchmarkDir = path.join(process.cwd(), 'data', 'benchmarks'); if (!fs.existsSync(benchmarkDir)) { fs.mkdirSync(benchmarkDir, { recursive: true }); } const benchmarkPath = path.join( benchmarkDir, 'parallel-vs-sequential.json' ); const existing = fs.existsSync(benchmarkPath) ? JSON.parse(fs.readFileSync(benchmarkPath, 'utf8')) : { runs: [] }; existing.runs.push(benchmarkResult); existing.latestRun = benchmarkResult; existing.averageSpeedup = existing.runs.reduce((sum: number, r: any) => sum + r.speedup, 0) / existing.runs.length; fs.writeFileSync(benchmarkPath, JSON.stringify(existing, null, 2)); console.log(`\nBenchmark results saved to: ${benchmarkPath}`); console.log('=== Performance Benchmark Complete ===\n'); }, 30000); // 30 second timeout it('should scale with different worker counts', async () => { const tests: TestDefinition[] = Array.from({ length: 16 }, (_, i) => ({ name: `scaling-test-${i}`, assertions: [], timeout: 100, retry: 0, })); const workerCounts = [1, 2, 4, 8]; const results: Array<{ workers: number; duration: number }> = []; console.log('\n=== Worker Scaling Test ==='); for (const workerCount of workerCounts) { const config: ParallelExecutionConfig = { maxWorkers: workerCount, timeout: 500, isolateTests: true, failFast: false, }; const start = Date.now(); await executor.executeTests(tests, config); const duration = Date.now() - start; results.push({ workers: workerCount, duration }); console.log(`${workerCount} workers: ${duration}ms`); } console.log('=== Worker Scaling Complete ===\n'); // More workers should generally be faster (with diminishing returns) expect(results[3].duration).toBeLessThanOrEqual(results[0].duration); }, 30000); it('should handle large test suite efficiently', async () => { const tests: TestDefinition[] = Array.from({ length: 50 }, (_, i) => ({ name: `large-suite-test-${i}`, assertions: [], timeout: 50, retry: 0, })); const config: ParallelExecutionConfig = { maxWorkers: 8, timeout: 200, isolateTests: true, failFast: false, }; console.log('\n=== Large Suite Test ==='); console.log( `Running ${tests.length} tests with ${config.maxWorkers} workers...` ); const start = Date.now(); const result = await executor.executeTests(tests, config); const duration = Date.now() - start; console.log(`Completed ${result.totalTests} tests in ${duration}ms`); console.log( `Average: ${(duration / tests.length).toFixed(2)}ms per test` ); console.log('=== Large Suite Complete ===\n'); expect(result.totalTests).toBe(50); expect(result.results).toHaveLength(50); // Should complete in reasonable time // 50 tests * 50ms = 2500ms sequential // With 8 workers, should be ~300-400ms expect(duration).toBeLessThan(1000); }, 30000); }); describe('Performance Metrics', () => { it('should track execution metrics accurately', async () => { const tests: TestDefinition[] = Array.from({ length: 10 }, (_, i) => ({ name: `metrics-test-${i}`, assertions: [], timeout: 100, retry: 0, })); const config: ParallelExecutionConfig = { maxWorkers: 4, timeout: 500, isolateTests: true, failFast: false, }; await executor.executeTests(tests, config); const metrics = executor.getMetrics(); expect(metrics).toBeDefined(); expect(Array.isArray(metrics)).toBe(true); }); }); });