How could I test my application if I mount a sinatra app into the jets app?

I have been using rspec to test my jets apps, but recently I wanted to test the Sinatra endpoints that I mounted on my app, and I don’t know how exactly do that.

To mount the app I followed the docs
but there are nothing documented about how is the jets way to be tested.

I tried in a traditional way but seems to not detect those sinatra endpoints. So any idea??? :smiley: