portfolio/e2e/hydration.spec.ts

import { test, expect } from '@playwright/test';

/**
 * Hydration Tests
 * Ensures React hydration works correctly without errors
 */
test.describe('Hydration Tests', () => {
  test('No hydration errors in console', async ({ page }) => {
    const consoleErrors: string[] = [];
    const consoleWarnings: string[] = [];
    
    // Capture console messages
    page.on('console', (msg) => {
      const text = msg.text();
      if (msg.type() === 'error') {
        consoleErrors.push(text);
      } else if (msg.type() === 'warning') {
        consoleWarnings.push(text);
      }
    });
    
    // Navigate to home page.
    // Avoid `networkidle` because the app has background polling/analytics requests.
    await page.goto('/en', { waitUntil: 'domcontentloaded' });
    // Give hydration a moment to run
    await page.waitForTimeout(1000);
    
    // Check for hydration errors
    const hydrationErrors = consoleErrors.filter(error => 
      error.includes('Hydration') || 
      error.includes('hydration') ||
      error.includes('Text content does not match') ||
      error.includes('Expected server HTML')
    );
    
    expect(hydrationErrors.length).toBe(0);
    
    // Log warnings for review (but don't fail)
    if (consoleWarnings.length > 0) {
      console.log('Console warnings:', consoleWarnings);
    }
  });

  test('No duplicate React key warnings', async ({ page }) => {
    const consoleWarnings: string[] = [];
    
    page.on('console', (msg) => {
      if (msg.type() === 'warning') {
        const text = msg.text();
        if (text.includes('key') || text.includes('duplicate')) {
          consoleWarnings.push(text);
        }
      }
    });
    
    await page.goto('/en', { waitUntil: 'domcontentloaded' });
    await page.waitForTimeout(500);
    
    // Check for duplicate key warnings
    const keyWarnings = consoleWarnings.filter(warning =>
      warning.includes('key') && warning.includes('duplicate')
    );
    
    expect(keyWarnings.length).toBe(0);
  });

  test('Client-side navigation works without hydration errors', async ({ page }) => {
    const consoleErrors: string[] = [];
    
    page.on('console', (msg) => {
      if (msg.type() === 'error') {
        consoleErrors.push(msg.text());
      }
    });
    
    await page.goto('/en', { waitUntil: 'domcontentloaded' });
    await page.waitForTimeout(500);
    
    // Navigate to projects page via link
    const projectsLink = page.locator('a[href*="/projects"]').first();
    if (await projectsLink.count() > 0) {
      await projectsLink.click();
      await page.waitForLoadState('domcontentloaded');
      await page.waitForTimeout(500);
      
      // Check for errors after navigation
      const hydrationErrors = consoleErrors.filter(error =>
        error.includes('Hydration') || error.includes('hydration')
      );
      
      expect(hydrationErrors.length).toBe(0);
    }
  });

  test('Server and client HTML match', async ({ page }) => {
    await page.goto('/en');
    
    // Get initial HTML
    const initialHTML = await page.content();
    
    // Wait for React to hydrate (avoid networkidle due to background requests)
    await page.waitForTimeout(1000);
    
    // Get HTML after hydration
    const hydratedHTML = await page.content();
    
    // Basic check: main structure should be similar
    // (exact match is hard due to dynamic content)
    expect(hydratedHTML.length).toBeGreaterThan(0);
    expect(initialHTML.length).toBeGreaterThan(0);
  });

  test('Interactive elements work after hydration', async ({ page }) => {
    await page.goto('/en');
    await page.waitForTimeout(1000);
    
    // Try to find and click interactive elements
    const buttons = page.locator('button, a[role="button"]');
    const buttonCount = await buttons.count();
    
    if (buttonCount > 0) {
      // Find a visible interactive element (desktop hides some mobile-only buttons)
      let clicked = false;
      for (let i = 0; i < Math.min(buttonCount, 25); i++) {
        const candidate = buttons.nth(i);
        if (await candidate.isVisible()) {
          await candidate.click().catch(() => {
            // Some buttons might be disabled or covered, that's OK
          });
          clicked = true;
          break;
        }
      }
      expect(clicked).toBe(true);
    }
  });
});