Testing Patterns & Best Practices

Testing Principles

1. Test Behavior, Not Implementation

• Test what the code does, not how it does it
• Tests shouldn't break when refactoring
• Focus on inputs and outputs

2. Arrange-Act-Assert (AAA)

// Arrange - Set up test data
const user = { name: 'John', email: 'john@example.com' }

// Act - Execute the code
const result = validateUser(user)