Authors of Dancer (and other) PSGI applications are probably accustomed to testing with Plack::Test, and while that is a venerated option, it is pretty bare-bones.
During advent last year, I wrote about Test::Mojo, showing the many easy and (dare I say) fun ways that you can use it to test your Mojolicious applications. If you missed it, go check it out.
I expect there are at least a few of you out there who read that and think, "I'd love to use that, but I don't use Mojolicious!"; well, you're in luck! With just a little role to bridge the gap, you can use Test::Mojo to test your PSGI applications too!