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Test Pyramid Strategy

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• Unit Tests - Fast, isolated testing
• Integration Tests - Component interaction
• End-to-End Tests - User journey validation

Unit Testing Example

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function sum(a, b) {
  return a + b;
}

test('sum adds two numbers correctly', () => {
  expect(sum(2, 3)).toBe(5);
  expect(sum(-1, 1)).toBe(0);
});

Test-Driven Development

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1. Red - Write failing test
2. Green - Make test pass
3. Refactor - Improve code quality

BDD Approach

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Feature: Shopping cart calculation

Scenario: Adding items to cart
  Given an empty shopping cart
  When a product is added
  Then the cart total should update

Mocking Strategies

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test('order service charges payment', async () => {
  const paymentService = {
    charge: jest.fn().mockResolvedValue({ success: true })
  };
  
  const orderService = new OrderService(paymentService);
  await orderService.placeOrder(order);
  
  expect(paymentService.charge).toHaveBeenCalledWith(100);
});

Test Coverage Guidelines

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• Aim for high coverage, not 100%
• Focus on critical business logic
• Don't write tests just for coverage
• Monitor uncovered critical paths

"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Testing is about building confidence, not satisfying metrics."
— Testing Philosophy

CI/CD Integration

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