))         })          commonTests()       })     })      describe('extensionId has not been installed', function () {       before(function () {         this.state = extensionState.browserActionRegistered(defaultAppState, Immutable.fromJS({           extensionId: 'abcd',           browserAction: abcdBrowserAction.get('browserAction')         }))       })        it('should not update the state', function () {         Immutable.is(this.state, defaultAppState)       })     })   })  // browserAction