[Qt-creator] Linked projects/workspace/'solutions'

[Robert Caldecott]

Nearly all the projects I create using Qt Creator have a separate unit
test project - how can I link projects so that when I open the main
project, the unit test one is also opened?  The same question would
apply to projects that use library projects, etc.  I'm thinking of
something similar to the Visual Studio 'solution' idea.  It wouldn't
have to be anything too complicated.

Is this possible?  If not, it is planned?  Can I hack my .pro files by
hand in the meantime?

Thanks in advance and apologies if this has been asked before.