yjs/tests/y-text.tests.js

import { init, compare } from './testHelper.js'

import * as t from 'lib0/testing.js'

/**
 * @param {t.TestCase} tc
 */
export const testBasicInsertAndDelete = tc => {
  const { users, text0 } = init(tc, { users: 2 })
  let delta

  text0.observe(event => {
    delta = event.delta
  })

  text0.delete(0, 0)
  t.assert(true, 'Does not throw when deleting zero elements with position 0')

  text0.insert(0, 'abc')
  t.assert(text0.toString() === 'abc', 'Basic insert works')
  t.compare(delta, [{ insert: 'abc' }])

  text0.delete(0, 1)
  t.assert(text0.toString() === 'bc', 'Basic delete works (position 0)')
  t.compare(delta, [{ delete: 1 }])

  text0.delete(1, 1)
  t.assert(text0.toString() === 'b', 'Basic delete works (position 1)')
  t.compare(delta, [{ retain: 1 }, { delete: 1 }])

  users[0].transact(() => {
    text0.insert(0, '1')
    text0.delete(0, 1)
  })
  t.compare(delta, [])

  compare(users)
}

/**
 * @param {t.TestCase} tc
 */
export const testBasicFormat = tc => {
  const { users, text0 } = init(tc, { users: 2 })
  let delta
  text0.observe(event => {
    delta = event.delta
  })
  text0.insert(0, 'abc', { bold: true })
  t.assert(text0.toString() === 'abc', 'Basic insert with attributes works')
  t.compare(text0.toDelta(), [{ insert: 'abc', attributes: { bold: true } }])
  t.compare(delta, [{ insert: 'abc', attributes: { bold: true } }])
  text0.delete(0, 1)
  t.assert(text0.toString() === 'bc', 'Basic delete on formatted works (position 0)')
  t.compare(text0.toDelta(), [{ insert: 'bc', attributes: { bold: true } }])
  t.compare(delta, [{ delete: 1 }])
  text0.delete(1, 1)
  t.assert(text0.toString() === 'b', 'Basic delete works (position 1)')
  t.compare(text0.toDelta(), [{ insert: 'b', attributes: { bold: true } }])
  t.compare(delta, [{ retain: 1 }, { delete: 1 }])
  text0.insert(0, 'z', { bold: true })
  t.assert(text0.toString() === 'zb')
  t.compare(text0.toDelta(), [{ insert: 'zb', attributes: { bold: true } }])
  t.compare(delta, [{ insert: 'z', attributes: { bold: true } }])
  // @ts-ignore
  t.assert(text0._start.right.right.right.string === 'b', 'Does not insert duplicate attribute marker')
  text0.insert(0, 'y')
  t.assert(text0.toString() === 'yzb')
  t.compare(text0.toDelta(), [{ insert: 'y' }, { insert: 'zb', attributes: { bold: true } }])
  t.compare(delta, [{ insert: 'y' }])
  text0.format(0, 2, { bold: null })
  t.assert(text0.toString() === 'yzb')
  t.compare(text0.toDelta(), [{ insert: 'yz' }, { insert: 'b', attributes: { bold: true } }])
  t.compare(delta, [{ retain: 1 }, { retain: 1, attributes: { bold: null } }])
  compare(users)
}