New Test
open /run/com.vaadin.tests.components.ui.UITabIndex?restartApplication
assertAttribute vaadin=runcomvaadintestscomponentsuiUITabIndex::@tabIndex 1
click vaadin=runcomvaadintestscomponentsuiUITabIndex::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[0]/VButton[0]/domChild[0]/domChild[0]
assertAttribute vaadin=runcomvaadintestscomponentsuiUITabIndex::@tabIndex -1
click vaadin=runcomvaadintestscomponentsuiUITabIndex::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[1]/VButton[0]/domChild[0]/domChild[0]
assertAttribute vaadin=runcomvaadintestscomponentsuiUITabIndex::@tabIndex 0
click vaadin=runcomvaadintestscomponentsuiUITabIndex::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VButton[0]/domChild[0]/domChild[0]
assertAttribute vaadin=runcomvaadintestscomponentsuiUITabIndex::@tabIndex 1