te the existing browserAction', function () {           let browserAction = this.state.getIn(['extensions', 'abcd', 'browserAction'])           assert.equal(browserAction.get('title'), 'title0')           assert.equal(browserAction.get('popup'), undefined)         })          commonTests()       })        describe('browser action does not exist', function () {         before(function () {           this.state = extensionState.browserActionRegistered(this.state, Immutable.fromJS({             extensionId: 'abcd',             browserAction: abcdBrowserAction.get('browserAction')           }))         })          it('should 