[Selenium] The commonly used validation method

Assert.assertTrue(tmpEl.getAttribute("class").contains("selected"),"The folder should be highlighted.");

Assert.assertFalse(dialog.isDisplayed(),buttonName+" dialog should close.");

Assert.assertEquals(hoverTxt, tabName,"The website not leads to "+tabName+" tab.");

Assert.assertNotEquals(null, checkIfFolderExist(folderName), "The new folder '"+folderName+"'should be listed in the first row of Folder.");

Assert.assertNull(batch, "The batch can be search out");