metamask-extension/test/unit/migrations/040-test.js

import assert from 'assert'
import migration40 from '../../../app/scripts/migrations/040'

describe('migration #40', function () {

  it('should update the version metadata', function (done) {
    const oldStorage = {
      'meta': {
        'version': 39,
      },
      'data': {},
    }

    migration40.migrate(oldStorage)
      .then((newStorage) => {
        assert.deepEqual(newStorage.meta, {
          'version': 40,
        })
        done()
      })
      .catch(done)
  })

  it('should delete ProviderApprovalController storage key', function (done) {
    const oldStorage = {
      'meta': {},
      'data': {
        'ProviderApprovalController': {},
        'foo': 'bar',
      },
    }

    migration40.migrate(oldStorage)
      .then((newStorage) => {
        assert.deepEqual(newStorage.data, { foo: 'bar' })
        done()
      })
      .catch(done)
  })

  it('should do nothing if no ProviderApprovalController storage key', function (done) {
    const oldStorage = {
      'meta': {},
      'data': { foo: 'bar' },
    }

    migration40.migrate(oldStorage)
      .then((newStorage) => {
        assert.deepEqual(newStorage.data, { foo: 'bar' })
        done()
      })
      .catch(done)
  })
})