что-то вроде
function shouldHaveTopics(...texts: string[]) {
let items = $("[role='main']").all(this.mailsContainerLocator).$$(".y6 span[id*=':']")
let visibleItems = items.filter(elem=> {return browser.wait(EC.visibilityOf(elem)), 3000).then(()=> true, ()=> false)
})
expect(visibleItems.getText()).toBe(texts)
return this;
}