Testing Best Practices

// Configure SDK for testing
const gopaynow = new GoPayNow({
  secretKey: 'sk_test_your_test_key',
  environment: 'sandbox'
});

// Test card numbers
const testCards = {
  success: '4242424242424242',
  declined: '4000000000000002',
  insufficient_funds: '4000000000009995'
};

// Jest test example
describe('Payment Link Creation', () => {
  it('should create a payment link successfully', async () => {
    const mockResponse = {
      id: 'pl_test_123',
      url: 'https://checkout.gopay.now/pl_test_123',
      amount: 5000
    };
    
    gopaynow.paymentLinks.create = jest.fn().mockResolvedValue(mockResponse);
    
    const result = await createPaymentLink(5000, 'USD');
    
    expect(result.url).toBeDefined();
    expect(result.amount).toBe(5000);
  });
});

// Integration test with real sandbox API
describe('Payment Flow Integration', () => {
  it('should process payment successfully', async () => {
    // Create payment link
    const paymentLink = await gopaynow.paymentLinks.create({
      amount: 2500,
      currency: 'USD'
    });
    
    expect(paymentLink.id).toMatch(/^pl_test_/);
    
    // Simulate payment completion
    const payment = await simulatePayment(paymentLink.id);
    
    expect(payment.status).toBe('completed');
  }, 10000); // 10 second timeout
});

// Test webhook endpoint
describe('Webhook Handler', () => {
  it('should handle payment.completed event', async () => {
    const mockEvent = {
      type: 'payment.completed',
      data: {
        id: 'pay_test_123',
        amount: 5000,
        status: 'completed'
      }
    };
    
    const signature = generateTestSignature(mockEvent);
    
    const response = await request(app)
      .post('/webhook')
      .set('x-gopaynow-signature', signature)
      .send(mockEvent)
      .expect(200);
  });
});