@Test public void initialLeftNavigationIsEmpty() { Navbar navbar = new Navbar("id"); tester().startComponentInPage(navbar); TagTester tagTester = tester().getTagById("nav-collapse"); TagTester ulTag = tagTester.getChild("style", "display:none"); Assert.assertThat(ulTag.getValue(), is(equalTo(""))); Assert.assertThat(ulTag.getName(), is(equalTo("ul"))); }