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

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

const storage = {
  meta: {},
  data: {},
}

describe('storage is migrated successfully', function () {
  it('should work', function (done) {
    migrationTemplate
      .migrate(storage)
      .then((migratedData) => {
        assert.equal(migratedData.meta.version, 0)
        done()
      })
      .catch(done)
  })
})