metamask-extension/test/unit/migrations/022-test.js

const assert = require('assert')
const migration22 = require('../../../app/scripts/migrations/022')
const properTime = (new Date()).getTime()
const storage = {
  "meta": {},
  "data": {
    "TransactionController": {
      "transactions": [
        { "status": "submitted" },
        { "status": "submitted", "submittedTime": properTime },
        {"status": "confirmed"},
      ]
    },
  },
}

describe('storage is migrated successfully where transactions that are submitted have submittedTimes', () => {
  it('should add submittedTime key on the txMeta if appropriate', (done) => {
    migration22.migrate(storage)
    .then((migratedData) => {
      const [txMeta1, txMeta2, txMeta3] = migratedData.data.TransactionController.transactions
      assert.equal(migratedData.meta.version, 22)
      // should have written a submitted time
      assert(txMeta1.submittedTime)
      // should not have written a submitted time because it already has one
      assert.equal(txMeta2.submittedTime, properTime)
      // should not have written a submitted time
      assert(!txMeta3.submittedTime)
      done()
    }).catch(done)
  })
})