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import { AnyStateMachine, Machine, StateNode } from '../src';import { flatten } from '../src/utils';
describe('document order', () => {  it('should specify the correct document order for each state node', () => {    const machine = Machine({      id: 'order',      initial: 'one',      states: {        one: {          initial: 'two',          states: {            two: {},            three: {              initial: 'four',              states: {                four: {},                five: {                  initial: 'six',                  states: {                    six: {}                  }                }              }            }          }        },        seven: {          type: 'parallel',          states: {            eight: {              initial: 'nine',              states: {                nine: {},                ten: {                  initial: 'eleven',                  states: {                    eleven: {},                    twelve: {}                  }                }              }            },            thirteen: {              type: 'parallel',              states: {                fourteen: {},                fifteen: {}              }            }          }        }      }    });
    function dfs(      node: AnyStateMachine    ): StateNode<any, any, any, any, any, any>[] {      return flatten([        node as any,        ...Object.keys(node.states).map((key) => dfs(node.states[key] as any))      ]);    }
    const allStateNodeOrders = dfs(machine).map((sn) => [sn.key, sn.order]);
    expect(allStateNodeOrders).toEqual([      ['order', 0],      ['one', 1],      ['two', 2],      ['three', 3],      ['four', 4],      ['five', 5],      ['six', 6],      ['seven', 7],      ['eight', 8],      ['nine', 9],      ['ten', 10],      ['eleven', 11],      ['twelve', 12],      ['thirteen', 13],      ['fourteen', 14],      ['fifteen', 15]    ]);  });});