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);
  });
});