overleaf/services/project-history/test/acceptance/js/LatestSnapshotTests.js

import { expect } from 'chai'
import mongodb from 'mongodb-legacy'
import nock from 'nock'
import { readFileSync } from 'node:fs'
import * as ProjectHistoryClient from './helpers/ProjectHistoryClient.js'
import * as ProjectHistoryApp from './helpers/ProjectHistoryApp.js'
const { ObjectId } = mongodb

const MockHistoryStore = () => nock('http://127.0.0.1:3100')
const MockWeb = () => nock('http://127.0.0.1:3000')

const fixture = path => new URL(`../fixtures/${path}`, import.meta.url)

describe('LatestSnapshot', function () {
  beforeEach(async function () {
    await ProjectHistoryApp.ensureRunning()

    this.historyId = new ObjectId().toString()
    MockHistoryStore().post('/api/projects').reply(200, {
      projectId: this.historyId,
    })

    const v1Project = await ProjectHistoryClient.initializeProject(
      this.historyId
    )
    this.projectId = new ObjectId().toString()
    MockWeb()
      .get(`/project/${this.projectId}/details`)
      .reply(200, {
        name: 'Test Project',
        overleaf: { history: { id: v1Project.id } },
      })
  })

  afterEach(function () {
    nock.cleanAll()
  })

  it('should return the snapshot with applied changes, metadata and without full content', async function () {
    MockHistoryStore()
      .get(`/api/projects/${this.historyId}/latest/history`)
      .replyWithFile(200, fixture('chunks/0-3.json'))

    const fixtureData = JSON.parse(
      readFileSync(fixture('chunks/0-3.json'), 'utf8')
    )
    const changes = fixtureData.chunk.history.changes
    const lastTimestamp = changes[changes.length - 1].timestamp

    const body = await ProjectHistoryClient.getLatestSnapshot(this.projectId)
    expect(body).to.deep.equal({
      snapshot: {
        files: {
          'main.tex': {
            hash: 'f28571f561d198b87c24cc6a98b78e87b665e22d',
            stringLength: 20649,
            operations: [{ textOperation: [1912, 'Hello world', 18726] }],
            metadata: { main: true },
          },
          'foo.tex': {
            hash: '4f785a4c192155b240e3042b3a7388b47603f423',
            stringLength: 41,
            operations: [{ textOperation: [26, '\n\nFour five six'] }],
          },
        },
        timestamp: lastTimestamp,
      },
      version: 3,
    })
  })
})