AddNullUserLastNameTest
waitForElementPresent link=Users
clickAndWait link=Users
clickAndWait link=Add
typeKeys _125_screenName testA
type _125_screenName testA
type _125_emailAddress testA@liferay.com
type _125_firstName testA
type _125_lastName
clickAndWait //input[@value='Save']
assertTextPresent You have entered invalid data. Please try again.
assertTextPresent Please enter a valid last name.