import assert from "node:assert/strict"
import test from "node:test"
import { getMessageFileIdentity } from "./message-file-identity.ts"

const file = (content, name = "attachment.txt") => ({ name, type: "text/plain",
  arrayBuffer: async () => new TextEncoder().encode(content).buffer })

test("reselecting identical file content keeps attachment retry identity", async () => {
  assert.equal(await getMessageFileIdentity(file("same")), await getMessageFileIdentity(file("same")))
})

test("equal-name equal-size files with different bytes cannot share retry identity", async () => {
  assert.notEqual(await getMessageFileIdentity(file("left")), await getMessageFileIdentity(file("next")))
})