Unsolved Loading an html file next to app on OSX

[TOMATO_QT]

Using WebEngineView, I'm trying to automatically load at launch an html file which is in the same directory as my .app bundle.

--DemoDirectory
-----Demo.app
-----demo1.html

I've discovered that QGuiApplication::applicationDirPath() points to a directory inside the bundle so that wasn't working.I made somewhat hackish progress with the code snippet below.

After concatenating the html file name, the path I end up with is

/Users/Tomato/Documents/builds/build-Timeline_Demo-Desktop_Qt_5_5_1_clang_64bit-Release/demo1.html

Which of course doesn't work, so I tried prepending `file://" on to that and still no joy. Am I doing something obviously wrong?

-in main.cpp

   QDir dir = QDir(QCoreApplication::applicationDirPath());
    dir.cdUp();
    dir.cdUp();
    dir.cdUp();
    engine.rootContext()->setContextProperty("workingDirectory", 
                                             dir.absolutePath());