ModelTest provides a way to check for common errors in implementations of http://doc.trolltech.com/4/qabstractitemmodel.html.

ModelTest continuously checks a model as it changes, helping to verify the state and catching many common errors the moment they show up such as:

• Verifing X number of rows have been inserted in the correct place after the signal rowsAboutToBeInserted() says X rows will be inserted.
• The parent of the first index of the first row is a QModelIndex()
• Calling index() twice in a row with the same values will return the same QModelIndex
• If rowCount() says there are X number of rows, model test will verify that is true.
• Many possible off by one bugs
• hasChildren() returns true if rowCount() is greater then zero.
• and many more...

To Use the model test do the following:

1. Include the pri file at the end of your project pro file using the include() command like so:

   include(../path/to/dir/modeltest.pri)
   

2. Then in your source include "modeltest.h" and instantiate ModelTest with your model so the test can live for the lifetime of your model. For example:

   #include <modeltest.h>
   
   QDirModel *model = new QDirModel(this);
   new ModelTest(model, this);
   

3. That is it. When the test finds a problem it will assert. modeltest.cpp contains some hints on how to fix problems that the test finds.