feat: geizhals scraper with cheerio + tests

tests/scrapers/geizhals.test.ts

@@ -0,0 +1,32 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { readFileSync } from 'node:fs'
+import { join } from 'node:path'
+import { geizhalsScraper } from '@/lib/scrapers/geizhals'
+
+const fixture = readFileSync(join(__dirname, '../fixtures/geizhals-gpu.html'), 'utf-8')
+
+beforeEach(() => {
+  global.fetch = vi.fn().mockResolvedValue({
+    ok: true,
+    status: 200,
+    text: async () => fixture,
+  }) as unknown as typeof fetch
+})
+
+describe('geizhalsScraper', () => {
+  it('extracts price and name', async () => {
+    const r = await geizhalsScraper.scrape('https://geizhals.de/test')
+    expect(r.price).toBeGreaterThan(0)
+    expect(r.currency).toBe('EUR')
+    expect(r.name).toBeTruthy()
+  })
+
+  it('returns error on HTTP failure', async () => {
+    global.fetch = vi.fn().mockResolvedValue({
+      ok: false, status: 503, text: async () => '',
+    }) as unknown as typeof fetch
+    const r = await geizhalsScraper.scrape('https://geizhals.de/test')
+    expect(r.price).toBeNull()
+    expect(r.error).toMatch(/HTTP 503/)
+  })
+})