Tests breakpoint at last line.
{
    breakpointId : <breakpointId>
    locations : [
        [0] : {
            columnNumber : 0
            lineNumber : 4
            scriptId : <scriptId>
        }
    ]
}
{
    breakpointId : <breakpointId>
    locations : [
        [0] : {
            columnNumber : 0
            lineNumber : 4
            scriptId : <scriptId>
        }
    ]
}
