ed', function () {     describe('extensionId has been installed', function () {       before(function () {         this.state = defaultAppState.setIn(['extensions', 'abcd'], Immutable.fromJS({}))       })        describe('browser action already exists', function () {         before(function () {           this.state = defaultAppState.setIn(['extensions', 'abcd'], abcdBrowserAction)           this.state = extensionState.browserActionRegistered(this.state, Immutable.fromJS({             extensionId: 'abcd',             browserAction: {               title: 'title0'             }           }))         })          it('should 