FAI WebApp Testing

Purpose

Build a complete test strategy for modern web apps with deterministic CI gates.

Test Pyramid

Step 1 - Unit Testing Baseline

import { describe, it, expect } from 'vitest';

describe('price formatter', () => {
  it('formats USD values', () => {
    expect(formatPrice(1999)).toBe('$19.99');
  });
});

Step 2 - Integration Testing

render(<CheckoutPage />);
await user.click(screen.getByRole('button', { name: /pay now/i }));
expect(await screen.findByText(/payment successful/i)).toBeInTheDocument();

Step 3 - E2E Journey

test('user can complete checkout', async ({ page }) => {
  await page.goto('/');
  await page.getByRole('link', { name: 'Pricing' }).click();
  await page.getByTestId('select-plan-pro').click();
  await expect(page.getByText('Order confirmed')).toBeVisible();
});

Step 4 - Accessibility Gate

import AxeBuilder from '@axe-core/playwright';
const results = await new AxeBuilder({ page }).analyze();
expect(results.violations).toEqual([]);

Step 5 - CI Quality Gates

Troubleshooting

Advanced Implementation Notes

Operational Guardrails

• Define measurable SLOs before rollout.
• Capture baseline metrics and compare deltas post-change.
• Add alert thresholds with explicit on-call ownership.
• Use environment-specific overrides for dev/staging/prod.

CI/CD and Validation Expansion

# Example verification sequence
npm run lint
npm test
npm run build

{
  "quality_gate": {
    "required": true,
    "min_score": 0.8,
    "block_on_failure": true
  }
}

Security and Compliance Checks

Performance and Cost Notes

• Budget requests and tokens per endpoint/class of workload.
• Profile p95 and p99 latency as separate objectives.
• Add caching only where correctness is preserved.
• Use periodic reports to catch drift in cost/quality.

Extended Troubleshooting