feat: commit bearer changesets in one write

src/lnurlcash/storage/bearers.baseline.cases.ts

@@ -0,0 +1,29 @@
+import {describe, expect, it, vi} from 'vitest'
+import {buildNoteUrl} from 'lnurlcash-kit'
+import type {Bearer} from '../types'
+import {deriveBearerAesKey} from '../keys'
+import {deleteBearerRecord, newBearerId, persistBearer} from '../storage'
+import {stubLocalStorage} from '../test-utils'
+
+const LINKING_KEY = new Uint8Array(32).fill(7)
+const K1 = 'aa'.repeat(32)
+const bearerFixture = (): Bearer => ({
+  id: newBearerId(),
+  url: buildNoteUrl('https://mint.example/w', K1, 21_000),
+  callback: 'https://mint.example/w/cb',
+  amount: 21_000,
+  verified: true,
+  createdAt: 1000,
+  updatedAt: 1000,
+})
+describe('baseline: per-record bearer persistence', () => {
+  it('persistBearer/deleteBearerRecord perform one write per call', async () => {
+    const storage = stubLocalStorage()
+    const key = await deriveBearerAesKey(LINKING_KEY)
+    const writes = vi.spyOn(storage, 'setItem')
+    await persistBearer(key, {...bearerFixture(), id: 'a'})
+    await persistBearer(key, {...bearerFixture(), id: 'b'})
+    await deleteBearerRecord('a')
+    expect(writes.mock.calls.filter(([keyName]) => keyName === 'sattle_bearers')).toHaveLength(3)
+  })
+})