Function testUndoNestedUndoIssue

tests/undo-redo.tests.js:446–491

 * @param {t.TestCase} _tc
 */
export const testUndoNestedUndoIssue = _tc => {
  const doc = new Y.Doc({ gc: false })
  const design = doc.get()
  const undoManager = new Y.UndoManager(design, { captureTimeout: 0 })

  const text = new Y.Type()

  const blocks1 = new Y.Type()
  const blocks1block = new Y.Type()

  doc.transact(() => {
    blocks1block.setAttr('text', 'Type Something')
    blocks1.push([blocks1block])
    text.setAttr('blocks', blocks1block)
    design.setAttr('text', text)
  })

  const blocks2 = new Y.Type()
  const blocks2block = new Y.Type()
  doc.transact(() => {
    blocks2block.setAttr('text', 'Something')
    blocks2.push([blocks2block])
    text.setAttr('blocks', blocks2block)
  })

  const blocks3 = new Y.Type()
  const blocks3block = new Y.Type()
  doc.transact(() => {
    blocks3block.setAttr('text', 'Something Else')
    blocks3.push([blocks3block])
    text.setAttr('blocks', blocks3block)
  })
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Something Else' }) }) }))
  undoManager.undo()
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Something' }) }) }))
  undoManager.undo()
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Type Something' }) }) }))
  undoManager.undo()
  t.compare(design.toDeltaDeep(), delta.from({}))
  undoManager.redo()
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Type Something' }) }) }))
  undoManager.redo()
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Something' }) }) }))
  undoManager.redo()
  t.compare(design.toDeltaDeep(), delta.from({ text: delta.from({ blocks: delta.from({ text: 'Something Else' }) }) }))
}

/**
 * This issue has been reported in https://github.com/yjs/yjs/issues/355