metamask-extension/test/unit/migrations/030-test.js

import assert from 'assert'
import migrationTemplate from '../../../app/scripts/migrations/030'

const storage = {
  meta: {},
  data: {
    NetworkController: {
      network: 'fail',
      provider: {
        chainId: 'fail',
        nickname: '',
        rpcTarget: 'https://api.myetherwallet.com/eth',
        ticker: 'ETH',
        type: 'rinkeby',
      },
    },
    PreferencesController: {
      frequentRpcListDetail: [
        {
          chainId: 'fail',
          nickname: '',
          rpcUrl: 'http://127.0.0.1:8545',
          ticker: '',
        },
        {
          chainId: '1',
          nickname: '',
          rpcUrl: 'https://api.myetherwallet.com/eth',
          ticker: 'ETH',
        },
      ],
    },
  },
}

describe('storage is migrated successfully', function () {
  it('should work', function (done) {
    migrationTemplate
      .migrate(storage)
      .then((migratedData) => {
        assert.equal(migratedData.meta.version, 30)
        assert.equal(
          migratedData.data.PreferencesController.frequentRpcListDetail[0]
            .chainId,
          undefined,
        )
        assert.equal(
          migratedData.data.PreferencesController.frequentRpcListDetail[1]
            .chainId,
          '1',
        )
        assert.equal(
          migratedData.data.NetworkController.provider.chainId,
          undefined,
        )
        assert.equal(migratedData.data.NetworkController.network, undefined)
        done()
      })
      .catch(done)
  })
})