)           })            it('should not update the state', function () {             Immutable.is(this.state, defaultAppState)           })            describe('with tabId', function () {             before(function () {               this.state = extensionState.browserActionUpdated(defaultAppState, Immutable.fromJS({                 extensionId: 'abcd',                 tabId: '0',                 browserAction: {                   title: 'tabTitle0'                 }               }))             })           })            it('should not update the state', function () {             Immutable.is(this.state, defaultAppState)           })         