Tests Debugger.setScriptSource
TestExpression(2,4) === 6
Update current script source 'a + b' -> 'a * b'..
{
    callFrames : [
    ]
    stackChanged : false
}
TestExpression(2,4) === 8
Update current script source 'a * b' -> 'a # b'..
{
    exceptionDetails : {
        columnNumber : 13
        exceptionId : <exceptionId>
        lineNumber : 1
        text : Uncaught SyntaxError: Invalid or unexpected token
    }
}
TestExpression(2,4) === 8