beforeEach(function () {
        appStart = new AppStart({
          user: userMock,
          window: windowMock
        });

        sinon.spy(userMock, 'upgradeFromUnfilteredAccountData');
        sinon.spy(userMock, 'upgradeFromSession');

        return appStart.upgradeStorageFormats();
      });
      beforeEach(() => {
        appStart = new AppStart({
          user: userMock,
          window: windowMock
        });

        sinon.spy(userMock, 'upgradeFromUnfilteredAccountData');
        sinon.spy(userMock, 'upgradeFromSession');
        sinon.spy(userMock, 'removeAccountsWithInvalidUid');

        return appStart.upgradeStorageFormats();
      });