ALERT: * The line below should have no text
ALERT: 
ALERT: * The line below should have the text 'undefined'
ALERT: undefined
ALERT: * The line below should have the text 'null'
ALERT: null
ALERT: * The lines below should have no text
CONFIRM: 
CONFIRM: 
ALERT: * The line below should have the text 'null'
CONFIRM: null
ALERT: * The lines below should have no text and no default text
PROMPT: , default text: 
PROMPT: , default text: 
ALERT: * The line below should have the text 'null' and the default text null
PROMPT: null, default text: null