For the unit testing purpose, I have a QFile writing to and reads from a file. However, I need to replace this file as a memory, such as QBuffer, since they are from the same base class QIODevice, so it won't be necessary to create the file to perform a unit test.

How can I write a method with QFile so it would write to Qbuffer or QByteArray, so I could verify it's contents acting like in memory instead? Likewise, for the other way around reading a Qbuffer from QFile.

What's the best way to approach this? It may require some advanced OOP with inheritance, but I'm not sure it will work.

Thanks in advance.