这是我的测试设置代码

const knex = require('../db').knex

beforeEach(() => knex.migrate.rollback()
  .then(() => knex.migrate.latest())
  .then(() => knex.seed.run())
)

afterEach(() => knex.migrate.rollback()
  .then(() => {})
)

获取以下错误

Knex:warning - Can't take lock to run migrations: Migration table is already locked
Knex:warning - If you are sure migrations are not running you can release the lock manually by deleting all the rows from migrations lock table: knex_migrations_lock
Unhandled rejection MigrationLocked: Migration table is already locked

      1) "before each" hook for "is not allowed"
Knex:warning - Can't take lock to run migrations: Migration table is already locked
Knex:warning - If you are sure migrations are not running you can release the lock manually by deleting all the rows from migrations lock table: knex_migrations_lock
      2) "after each" hook for "is not allowed"

这里是 db.js ```
const Knex = require('knex')
const Bookshelf = require('bookshelf')
const config = require('config')

var bookshelf = null
var knex = null

exports.init = () => {
knex = Knex(config.get('database'))
if (process.env.NODE_ENV !== 'test') {
knex.migrate.latest()
}

bookshelf = Bookshelf(knex)
bookshelf.plugin('registry')
bookshelf.plugin('pagination')
bookshelf.plugin('bookshelf-camelcase')
bookshelf.plugin('visibility')

exports.bookshelf = bookshelf
exports.knex = knex

}
`mocha.opts`
--ui bdd
--slow 70
--growl
--recursive
--reporter spec