metamask-extension/test/unit/migrations/027-test.js

import assert from 'assert'
import firstTimeState from '../../../app/scripts/first-time-state'
import migration27 from '../../../app/scripts/migrations/027'

const oldStorage = {
  'meta': {},
  'data': {
    'TransactionController': {
      'transactions': [
      ],
    },
  },
}

const transactions = []

while (transactions.length < 9) {
  transactions.push({ status: 'rejected' })
  transactions.push({ status: 'unapproved' })
  transactions.push({ status: 'approved' })
}

oldStorage.data.TransactionController.transactions = transactions

describe('migration #27', function () {
  it('should remove rejected transactions', function (done) {
    migration27.migrate(oldStorage)
      .then((newStorage) => {
        const newTransactions = newStorage.data.TransactionController.transactions
        assert.equal(newTransactions.length, 6, 'transactions is expected to have the length of 6')
        newTransactions.forEach((txMeta) => {
          if (txMeta.status === 'rejected') {
            done(new Error('transaction was found with a status of rejected'))
          }
        })
        done()
      })
      .catch(done)
  })

  it('should successfully migrate first time state', function (done) {
    migration27.migrate({
      meta: {},
      data: firstTimeState,
    })
      .then((migratedData) => {
        assert.equal(migratedData.meta.version, migration27.version)
        done()
      }).catch(done)
  })
})