How to use the lib0/testing.js.assert function in lib0

xml1.observe(e => {
    remoteEvent = e
  })
  xml0.setAttribute('key', 'value')
  t.assert(event.attributesChanged.has('key'), 'YXmlEvent.attributesChanged on updated key')
  testConnector.flushAllMessages()
  t.assert(remoteEvent.attributesChanged.has('key'), 'YXmlEvent.attributesChanged on updated key (remote)')
  // check attributeRemoved
  xml0.removeAttribute('key')
  t.assert(event.attributesChanged.has('key'), 'YXmlEvent.attributesChanged on removed attribute')
  testConnector.flushAllMessages()
  t.assert(remoteEvent.attributesChanged.has('key'), 'YXmlEvent.attributesChanged on removed attribute (remote)')
  xml0.insert(0, [new Y.XmlText('some text')])
  t.assert(event.childListChanged, 'YXmlEvent.childListChanged on inserted element')
  testConnector.flushAllMessages()
  t.assert(remoteEvent.childListChanged, 'YXmlEvent.childListChanged on inserted element (remote)')
  // test childRemoved
  xml0.delete(0)
  t.assert(event.childListChanged, 'YXmlEvent.childListChanged on deleted element')
  testConnector.flushAllMessages()
  t.assert(remoteEvent.childListChanged, 'YXmlEvent.childListChanged on deleted element (remote)')
  compare(users)
}

testConnector.flushAllMessages()

  t.assert(map1.get('number') === 1, 'client 1 received the update (number)')
  t.assert(map1.get('string') === 'hello Y', 'client 1 received the update (string)')
  t.assert(map1.get('boolean0') === false, 'client 1 computed the change (boolean)')
  t.assert(map1.get('boolean1') === true, 'client 1 computed the change (boolean)')
  t.compare(map1.get('object'), { key: { key2: 'value' } }, 'client 1 received the update (object)')
  t.assert(map1.get('y-map').get('y-array').get(0) === -1, 'client 1 received the update (type)')

  // compare disconnected user
  t.assert(map2.get('number') === 1, 'client 2 received the update (number) - was disconnected')
  t.assert(map2.get('string') === 'hello Y', 'client 2 received the update (string) - was disconnected')
  t.assert(map2.get('boolean0') === false, 'client 2 computed the change (boolean)')
  t.assert(map2.get('boolean1') === true, 'client 2 computed the change (boolean)')
  t.compare(map2.get('object'), { key: { key2: 'value' } }, 'client 2 received the update (object) - was disconnected')
  t.assert(map2.get('y-map').get('y-array').get(0) === -1, 'client 2 received the update (type) - was disconnected')
  compare(users)
}

t.assert(event.path[0] === 'map')
      // @ts-ignore
      dmapid = event.target.get('deepmap')._item.id
    })
  })
  testConnector.flushAllMessages()
  const _map3 = map3.get('map')
  _map3.set('deepmap', new Y.Map())
  testConnector.flushAllMessages()
  const _map2 = map2.get('map')
  _map2.set('deepmap', new Y.Map())
  testConnector.flushAllMessages()
  const dmap1 = _map1.get('deepmap')
  const dmap2 = _map2.get('deepmap')
  const dmap3 = _map3.get('deepmap')
  t.assert(calls > 0)
  t.assert(compareIDs(dmap1._item.id, dmap2._item.id))
  t.assert(compareIDs(dmap1._item.id, dmap3._item.id))
  // @ts-ignore we want the possibility of dmapid being undefined
  t.assert(compareIDs(dmap1._item.id, dmapid))
  compare(users)
}

map.set('y-array', new Y.Array())
  const array = map.get('y-array')
  array.insert(0, [0])
  array.insert(0, [-1])

  t.assert(map0.get('number') === 1, 'client 0 computed the change (number)')
  t.assert(map0.get('string') === 'hello Y', 'client 0 computed the change (string)')
  t.assert(map0.get('boolean0') === false, 'client 0 computed the change (boolean)')
  t.assert(map0.get('boolean1') === true, 'client 0 computed the change (boolean)')
  t.compare(map0.get('object'), { key: { key2: 'value' } }, 'client 0 computed the change (object)')
  t.assert(map0.get('y-map').get('y-array').get(0) === -1, 'client 0 computed the change (type)')

  users[2].connect()
  testConnector.flushAllMessages()

  t.assert(map1.get('number') === 1, 'client 1 received the update (number)')
  t.assert(map1.get('string') === 'hello Y', 'client 1 received the update (string)')
  t.assert(map1.get('boolean0') === false, 'client 1 computed the change (boolean)')
  t.assert(map1.get('boolean1') === true, 'client 1 computed the change (boolean)')
  t.compare(map1.get('object'), { key: { key2: 'value' } }, 'client 1 received the update (object)')
  t.assert(map1.get('y-map').get('y-array').get(0) === -1, 'client 1 received the update (type)')

  // compare disconnected user
  t.assert(map2.get('number') === 1, 'client 2 received the update (number) - was disconnected')
  t.assert(map2.get('string') === 'hello Y', 'client 2 received the update (string) - was disconnected')
  t.assert(map2.get('boolean0') === false, 'client 2 computed the change (boolean)')
  t.assert(map2.get('boolean1') === true, 'client 2 computed the change (boolean)')
  t.compare(map2.get('object'), { key: { key2: 'value' } }, 'client 2 received the update (object) - was disconnected')
  t.assert(map2.get('y-map').get('y-array').get(0) === -1, 'client 2 received the update (type) - was disconnected')
  compare(users)
}

// @ts-ignore
      dmapid = event.target.get('deepmap')._item.id
    })
  })
  testConnector.flushAllMessages()
  const _map3 = map3.get('map')
  _map3.set('deepmap', new Y.Map())
  testConnector.flushAllMessages()
  const _map2 = map2.get('map')
  _map2.set('deepmap', new Y.Map())
  testConnector.flushAllMessages()
  const dmap1 = _map1.get('deepmap')
  const dmap2 = _map2.get('deepmap')
  const dmap3 = _map3.get('deepmap')
  t.assert(calls > 0)
  t.assert(compareIDs(dmap1._item.id, dmap2._item.id))
  t.assert(compareIDs(dmap1._item.id, dmap3._item.id))
  // @ts-ignore we want the possibility of dmapid being undefined
  t.assert(compareIDs(dmap1._item.id, dmapid))
  compare(users)
}

t.compare(map0.get('object'), { key: { key2: 'value' } }, 'client 0 computed the change (object)')
  t.assert(map0.get('y-map').get('y-array').get(0) === -1, 'client 0 computed the change (type)')

  users[2].connect()
  testConnector.flushAllMessages()

  t.assert(map1.get('number') === 1, 'client 1 received the update (number)')
  t.assert(map1.get('string') === 'hello Y', 'client 1 received the update (string)')
  t.assert(map1.get('boolean0') === false, 'client 1 computed the change (boolean)')
  t.assert(map1.get('boolean1') === true, 'client 1 computed the change (boolean)')
  t.compare(map1.get('object'), { key: { key2: 'value' } }, 'client 1 received the update (object)')
  t.assert(map1.get('y-map').get('y-array').get(0) === -1, 'client 1 received the update (type)')

  // compare disconnected user
  t.assert(map2.get('number') === 1, 'client 2 received the update (number) - was disconnected')
  t.assert(map2.get('string') === 'hello Y', 'client 2 received the update (string) - was disconnected')
  t.assert(map2.get('boolean0') === false, 'client 2 computed the change (boolean)')
  t.assert(map2.get('boolean1') === true, 'client 2 computed the change (boolean)')
  t.compare(map2.get('object'), { key: { key2: 'value' } }, 'client 2 received the update (object) - was disconnected')
  t.assert(map2.get('y-map').get('y-array').get(0) === -1, 'client 2 received the update (type) - was disconnected')
  compare(users)
}

export const testNewChildDoesNotEmitEventInTransaction = tc => {
  const { array0, users } = init(tc, { users: 2 })
  let fired = false
  users[0].transact(() => {
    const newMap = new Y.Map()
    newMap.observe(() => {
      fired = true
    })
    array0.insert(0, [newMap])
    newMap.set('tst', 42)
  })
  t.assert(!fired, 'Event does not trigger')
}

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, [])

const { testConnector, users, map0, map1, map2 } = init(tc, { users: 3 })
  users[2].disconnect()

  map0.set('number', 1)
  map0.set('string', 'hello Y')
  map0.set('object', { key: { key2: 'value' } })
  map0.set('y-map', new Y.Map())
  map0.set('boolean1', true)
  map0.set('boolean0', false)
  const map = map0.get('y-map')
  map.set('y-array', new Y.Array())
  const array = map.get('y-array')
  array.insert(0, [0])
  array.insert(0, [-1])

  t.assert(map0.get('number') === 1, 'client 0 computed the change (number)')
  t.assert(map0.get('string') === 'hello Y', 'client 0 computed the change (string)')
  t.assert(map0.get('boolean0') === false, 'client 0 computed the change (boolean)')
  t.assert(map0.get('boolean1') === true, 'client 0 computed the change (boolean)')
  t.compare(map0.get('object'), { key: { key2: 'value' } }, 'client 0 computed the change (object)')
  t.assert(map0.get('y-map').get('y-array').get(0) === -1, 'client 0 computed the change (type)')

  users[2].connect()
  testConnector.flushAllMessages()

  t.assert(map1.get('number') === 1, 'client 1 received the update (number)')
  t.assert(map1.get('string') === 'hello Y', 'client 1 received the update (string)')
  t.assert(map1.get('boolean0') === false, 'client 1 computed the change (boolean)')
  t.assert(map1.get('boolean1') === true, 'client 1 computed the change (boolean)')
  t.compare(map1.get('object'), { key: { key2: 'value' } }, 'client 1 received the update (object)')
  t.assert(map1.get('y-map').get('y-array').get(0) === -1, 'client 1 received the update (type)')

export const testTreewalker = tc => {
  const { users, xml0 } = init(tc, { users: 3 })
  let paragraph1 = new Y.XmlElement('p')
  let paragraph2 = new Y.XmlElement('p')
  let text1 = new Y.XmlText('init')
  let text2 = new Y.XmlText('text')
  paragraph1.insert(0, [text1, text2])
  xml0.insert(0, [paragraph1, paragraph2, new Y.XmlElement('img')])
  let allParagraphs = xml0.querySelectorAll('p')
  t.assert(allParagraphs.length === 2, 'found exactly two paragraphs')
  t.assert(allParagraphs[0] === paragraph1, 'querySelectorAll found paragraph1')
  t.assert(allParagraphs[1] === paragraph2, 'querySelectorAll found paragraph2')
  t.assert(xml0.querySelector('p') === paragraph1, 'querySelector found paragraph1')
  compare(users)
}