Testing

Test Structure

Unit Tests

Tests are organized by module in the tests/ directory, mirroring the src/ structure.

tests/
├── lambda/
│   ├── discordBot.test.js
│   ├── telegramBot.test.js
│   └── metaBot.test.js
├── utils/
│   ├── monitoringUtils.test.js
│   ├── backupUtils.test.js
│   └── analyticsUtils.test.js
└── setup.js

Running Tests

Basic Test Commands

# Run all tests
npm test

# Run tests with watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

# Run specific test file
npm test -- tests/lambda/discordBot.test.js

Test Environment

Tests use a dedicated test environment with:

• Mock AWS services
• Test database
• Mock webhooks
• Sample test data

Writing Tests

Test Structure Example

describe('ModuleName', () => {
  beforeEach(() => {
    // Setup for each test
  });

  afterEach(() => {
    // Cleanup after each test
  });

  describe('functionName', () => {
    it('should handle successful case', async () => {
      // Arrange
      const input = {};
      
      // Act
      const result = await functionName(input);
      
      // Assert
      expect(result).toBeDefined();
    });

    it('should handle error case', async () => {
      // Test error scenarios
    });
  });
});

Mocking

Service Mocks

jest.mock('@aws-sdk/client-dynamodb', () => ({
  DynamoDBClient: jest.fn(() => ({
    send: jest.fn()
  }))
}));

API Mocks

global.fetch = jest.fn(() => 
  Promise.resolve({
    ok: true,
    json: () => Promise.resolve({ data: 'test' })
  })
);

Test Categories

1. Unit Tests

• Test individual functions
• Mock dependencies
• Fast execution
• High coverage

2. Integration Tests

• Test multiple components
• Limited mocking
• Database operations
• API interactions

3. End-to-End Tests

• Full system testing
• Real dependencies
• Complete workflows
• Performance testing

Test Data

Sample Data

• Located in tests/fixtures/
• JSON format
• Platform-specific samples
• Error case samples

Mock Services

• DynamoDB Local
• Mock webhooks
• Test storage bucket
• Test authentication

Coverage Requirements

Minimum Coverage

• Statements: 80%
• Branches: 80%
• Functions: 80%
• Lines: 80%

Critical Paths

• Authentication flows
• Data validation
• Error handling
• Platform integrations

Testing Tools

Jest Configuration

module.exports = {
  testEnvironment: 'node',
  setupFiles: ['<rootDir>/tests/setup.js'],
  collectCoverageFrom: ['src/**/*.js'],
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80
    }
  }
};

Test Utilities

• Jest matchers
• Custom assertions
• Test helpers
• Mock factories

Test Best Practices

1. Test Organization

• Group related tests
• Clear descriptions
• Isolated test cases
• Proper setup/teardown

2. Test Quality

• Test edge cases
• Error scenarios
• Boundary conditions
• Performance limits

3. Test Maintenance

• Regular updates
• Remove obsolete tests
• Update dependencies
• Monitor coverage

Debugging Tests

Common Issues

1. Async timing problems
2. Mock configuration
3. Environment variables
4. Database connections

Solutions

1. Use proper async/await
2. Verify mock setup
3. Check test environment
4. Validate connections

Performance Testing

Load Tests

• Response times
• Concurrent requests
• Resource usage
• Error rates

Stress Tests

• System limits
• Recovery behavior
• Error handling
• Resource cleanup

Security Testing

Authentication Tests

• Token validation
• Permission checks
• Rate limiting
• Error responses

Data Protection

• Input validation
• Output sanitization
• Encryption
• Access control

Continuous Integration

GitHub Actions

• Automated testing
• Coverage reports
• Dependency checks
• Security scans

Test Reports

• Test results
• Coverage metrics
• Performance data
• Error logs