On the Laravel News site there's a quick tutorial posted showing you how to use named routes in Lumen in writing tests for your application.
When writing tests in Lumen, I recently discovered that the route() helper doesn’t work with tests out-of-the-box.
I prefer to define named routes and make requests against them in my tests. If you follow the Lumen documentation, the typical way that you make a request for a test [of the return of a JSON endpoint results in an error message]. [...] If you inspect things a little closer, you can see the issue: [...] Interestingly, the route doesn’t look quite right, and the router is returning the / route. It looks like the localhost part of the request isn’t being set, and the route isn’t matching. We can fix that by bootstrapping the request as Laravel does.
The post then walks you through the manual process of bootstrapping things so that routes are correctly resolved. This includes changes to the code for the base test case to handle the "boot" and set the path value for the request correctly.