🎉 init

app/utils/paymentLinkCache.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from 'vitest'
+import { readCachedPaymentLink, writeCachedPaymentLink } from './paymentLinkCache'
+
+function createMockStorage(): Storage {
+  const store = new Map<string, string>()
+  return {
+    getItem: (key: string) => store.get(key) ?? null,
+    setItem: (key: string, value: string) => void store.set(key, value),
+    removeItem: (key: string) => void store.delete(key),
+    clear: () => store.clear(),
+    key: () => null,
+    get length() { return store.size },
+  }
+}
+
+describe('payment link cache', () => {
+  it('returns null when nothing is cached', () => {
+    expect(readCachedPaymentLink(createMockStorage())).toBeNull()
+  })
+
+  it('round-trips a cached link', () => {
+    const storage = createMockStorage()
+    writeCachedPaymentLink(storage, 'https://paypal.me/alice')
+    expect(readCachedPaymentLink(storage)).toBe('https://paypal.me/alice')
+  })
+
+  it('overwrites a previously cached link', () => {
+    const storage = createMockStorage()
+    writeCachedPaymentLink(storage, 'https://paypal.me/alice')
+    writeCachedPaymentLink(storage, 'https://paypal.me/bob')
+    expect(readCachedPaymentLink(storage)).toBe('https://paypal.me/bob')
+  })
+})