A testing strategy defines what to test, how much, and when. Use the testing trophy/pyramid as a guide: prioritize integration tests, supplement with unit tests for complex logic, and use E2E for critical paths. Consider cost, speed, and confidence.
Testing Trophy Approach:
Strategy Components:
Prioritization:
Cost-Benefit Analysis:
// E-commerce app testing strategy
/**
* CRITICAL PATH TESTS (E2E)
* - Checkout flow end-to-end
* - User authentication
* - Payment processing
*
* INTEGRATION TESTS
* - Cart operations with API
* - Product search and filtering
* - User profile updates
* - Order history display
*
* UNIT TESTS
* - Price calculation logic
* - Discount application rules
* - Form validation functions
* - Data transformation utilities
*/
// jest.config.js - Different configs for different test types
module.exports = {
projects: [
{
displayName: 'unit',
testMatch: ['<rootDir>/src/**/*.unit.test.{js,jsx}'],
testEnvironment: 'node'
},
{
displayName: 'integration',
testMatch: ['<rootDir>/src/**/*.integration.test.{js,jsx}'],
testEnvironment: 'jsdom',
setupFilesAfterEnv: ['<rootDir>/test/setupIntegration.js']
}
],
coverageThreshold: {
global: { branches: 80, functions: 80, lines: 80 },
'./src/utils/pricing/': { branches: 95, functions: 95 }, // Critical
'./src/components/': { branches: 70, functions: 70 } // Lower for UI
}
};