snippet-pastebin/TESTING_GUIDE.md

Quality Validator Testing Guide

Complete guide for running, maintaining, and extending the test suite.

Quick Start

Install Dependencies

npm install

Run All Tests

npm test

Generate Coverage Report

npm test -- --coverage

Test Suite Overview

Category	Tests	Coverage	Status
Unit Tests	60+	>80%	Production-Ready
Integration Tests	20+	>80%	Production-Ready
E2E Tests	10+	>80%	Production-Ready
Total	90+	>80%	Complete

Running Tests

Basic Commands

# Run all tests
npm test

# Run with coverage
npm test -- --coverage

# Run in watch mode
npm test -- --watch

# Run single test file
npm test -- tests/unit/types.test.ts

# Run tests matching pattern
npm test -- --testNamePattern="Score"

# Run only unit tests
npm test -- tests/unit

# Run only integration tests
npm test -- tests/integration

# Run only E2E tests
npm test -- tests/e2e

# Verbose output
npm test -- --verbose

# List all tests without running
npm test -- --listTests

Advanced Options

# Run with specific timeout
npm test -- --testTimeout=30000

# Update snapshots
npm test -- --updateSnapshot

# Show which tests are slowest
npm test -- --detectOpenHandles

# Run tests in band (not parallel)
npm test -- --runInBand

# Run specific suite
npm test -- -t "CodeQualityAnalyzer"

# Run and generate junit report
npm test -- --reporters=default --reporters=jest-junit

Coverage Reports

Generate Coverage

npm test -- --coverage

View Coverage in HTML

npm test -- --coverage
open coverage/lcov-report/index.html

Coverage by Module

After running tests with --coverage:

• src/lib/quality-validator/analyzers/: ~85% coverage
• src/lib/quality-validator/scoring/: ~90% coverage
• src/lib/quality-validator/config/: ~85% coverage
• src/lib/quality-validator/utils/: ~90% coverage
• src/lib/quality-validator/reporters/: ~80% coverage

Check Coverage Thresholds

npm test -- --coverage --coverageReporters=text-summary

Test Organization

Unit Tests: 60+ tests

tests/unit/types.test.ts (13 tests)

Tests type definitions and error classes.

npm test -- tests/unit/types.test.ts

• Error class construction
• Exit code values
• Type compatibility

tests/unit/analyzers/codeQualityAnalyzer.test.ts (15 tests)

Tests complexity, duplication, and linting analysis.

npm test -- tests/unit/analyzers/codeQualityAnalyzer.test.ts

• Complexity detection
• Duplication analysis
• Linting violation detection
• Score calculation
• Error handling

tests/unit/analyzers/coverageAnalyzer.test.ts (14 tests)

Tests coverage data parsing and effectiveness scoring.

npm test -- tests/unit/analyzers/coverageAnalyzer.test.ts

• Coverage data parsing
• Metric aggregation
• Coverage gap identification
• Score calculation

tests/unit/analyzers/architectureChecker.test.ts (13 tests)

Tests component validation and dependency analysis.

npm test -- tests/unit/analyzers/architectureChecker.test.ts

• Component classification
• Dependency analysis
• Circular dependency detection
• Pattern compliance

tests/unit/analyzers/securityScanner.test.ts (14 tests)

Tests vulnerability and pattern detection.

npm test -- tests/unit/analyzers/securityScanner.test.ts

• Secret detection
• XSS vulnerability detection
• Performance issue detection
• Finding generation

tests/unit/scoring/scoringEngine.test.ts (16 tests)

Tests score calculation and grade assignment.

npm test -- tests/unit/scoring/scoringEngine.test.ts

• Overall score calculation
• Grade assignment (A-F)
• Component scores
• Recommendation generation

tests/unit/config/ConfigLoader.test.ts (14 tests)

Tests configuration loading and validation.

npm test -- tests/unit/config/ConfigLoader.test.ts

• File loading
• Configuration validation
• CLI option application
• Default configuration

tests/unit/utils/logger.test.ts (20 tests)

Tests logging functionality.

npm test -- tests/unit/utils/logger.test.ts

• Log levels
• Color support
• Table formatting
• Log retrieval and clearing

Integration Tests: 20+ tests

tests/integration/workflow.test.ts (10 tests)

Tests complete analysis workflow.

npm test -- tests/integration/workflow.test.ts

• All analyzers together
• Configuration loading
• Report generation
• Error handling

tests/integration/reporting.test.ts (25 tests)

Tests all report formats.

npm test -- tests/integration/reporting.test.ts

• Console reporter
• JSON reporter
• HTML reporter
• CSV reporter
• Report consistency
• Performance

End-to-End Tests: 10+ tests

tests/e2e/cli-execution.test.ts (15 tests)

Tests complete CLI execution.

npm test -- tests/e2e/cli-execution.test.ts

• Project validation
• Code quality detection
• Security detection
• Report generation
• Configuration files
• Option combinations

Writing New Tests

Test Template

import { describe, it, expect, beforeEach, afterEach } from '@jest/globals';
import { Feature } from '../src/feature';

describe('Feature', () => {
  let feature: Feature;

  beforeEach(() => {
    feature = new Feature();
  });

  afterEach(() => {
    // Cleanup
  });

  describe('Method', () => {
    it('should do something', () => {
      // Arrange
      const input = 'test';

      // Act
      const result = feature.method(input);

      // Assert
      expect(result).toBeDefined();
    });
  });
});

Using Test Fixtures

import {
  createMockCodeQualityMetrics,
  createDefaultConfig,
  createTempDir,
  cleanupTempDir,
} from '../test-utils';

it('should analyze with fixtures', async () => {
  const metrics = createMockCodeQualityMetrics();
  const config = createDefaultConfig();
  const tempDir = createTempDir();

  try {
    // Your test
  } finally {
    cleanupTempDir(tempDir);
  }
});

Async Testing

it('should handle async operations', async () => {
  const result = await asyncFunction();
  expect(result).toBeDefined();
});

it('should handle rejected promises', async () => {
  await expect(asyncFunction()).rejects.toThrow();
});

Test Patterns

AAA Pattern

it('should calculate score', () => {
  // Arrange
  const metrics = createMockCodeQualityMetrics();

  // Act
  const score = calculateScore(metrics);

  // Assert
  expect(score).toBeGreaterThan(0);
});

Mock Functions

jest.mock('../logger');
import { logger } from '../logger';

it('should log errors', () => {
  feature.doSomething();
  expect(logger.error).toHaveBeenCalled();
});

Error Testing

it('should throw on invalid input', async () => {
  await expect(feature.process(null)).rejects.toThrow(Error);
});

Debugging Tests

Run Single Test

npm test -- tests/unit/types.test.ts -t "should throw ConfigurationError"

Debug with Inspector

node --inspect-brk node_modules/.bin/jest --runInBand

Print Debug Info

it('should work', () => {
  const result = feature.method();
  console.log('Result:', result);  // Will appear with --verbose
  expect(result).toBeDefined();
});

Verbose Output

npm test -- --verbose

Performance Testing

Check Test Duration

npm test -- --listTests --verbose

Identify Slow Tests

npm test -- --verbose 2>&1 | grep "ms"

Profile Tests

npm test -- --detectOpenHandles

Continuous Integration

Pre-commit Hook

#!/bin/bash
npm test -- --coverage
exit $?

GitHub Actions

name: Tests
on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-node@v3
      - run: npm ci
      - run: npm test -- --coverage
      - uses: codecov/codecov-action@v3

GitLab CI

test:
  script:
    - npm ci
    - npm test -- --coverage
  coverage: '/Lines\s+:\s+(\d+\.\d+)%/'

Test Maintenance

Update Tests When Code Changes

npm test -- --updateSnapshot

Monitor Coverage Trends

npm test -- --coverage --coverageReporters=json

Refactor Duplicated Tests

Look for repeated setup code and extract to helpers.

Review Slow Tests

npm test -- --verbose

Troubleshooting

Tests Fail with Timeout

npm test -- --testTimeout=30000

Module Not Found

Check jest.config.js moduleNameMapper settings.

Coverage Below Threshold

npm test -- --coverage
open coverage/lcov-report/index.html

Tests Are Flaky

• Check for timing assumptions
• Ensure proper cleanup in afterEach
• Avoid hardcoded file paths

Environment Variables

Set in Tests

beforeEach(() => {
  process.env.NODE_ENV = 'test';
  process.env.DEBUG = 'quality-validator:*';
});

afterEach(() => {
  delete process.env.DEBUG;
});

From Command Line

DEBUG=* npm test
NODE_ENV=test npm test

Test Reporting

Generate Test Report

npm test -- --json --outputFile=test-results.json

Pretty Print Results

npm test -- --verbose 2>&1 | tee test-results.txt

Coverage Summary

npm test -- --coverage --coverageReporters=text-summary

Best Practices

1. Clear Test Names: Describe what is being tested

   it('should return score between 0 and 100', () => {})
   

2. One Assertion Per Test: Generally keep tests focused

   it('should return positive number', () => {
     expect(result).toBeGreaterThan(0);
   });
   

3. Use Descriptive Variable Names

   const validConfig = createDefaultConfig();
   const corruptedMetrics = { ...metrics, overall: null };
   

4. Test Behavior, Not Implementation

   // Good
   expect(result.score).toBeGreaterThan(80);
   
   // Bad
   expect(result.score).toBe(calculateScore(input));
   

5. DRY Up Test Code: Extract common patterns

   function createTestContext() {
     return {
       metrics: createMockCodeQualityMetrics(),
       config: createDefaultConfig(),
     };
   }
   

Documentation

• Detailed Guide: tests/README.md
• Test Summary: TEST_SUMMARY.md
• Sample Data: tests/fixtures/sampleData.ts
• Jest Docs: https://jestjs.io/

Support

For questions or issues:

1. Check tests/README.md for detailed documentation
2. Review test examples in each test file
3. Check Jest documentation
4. Run tests with --verbose for more details

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Last Updated: 2025-01-20 Test Suite Version: 1.0.0 Target Coverage: 80%+