Mimic Repos route matching logic in unit test

This spec is really testing Sinatra's routing logic rather than
our software, so it feels like like a superfluous test.
While we decide what to do with it, we mimic the routing logic here
to preserve the previous specs.

Author: BanzaiMan

spec/unit/endpoint/repos_spec.rb

@@ -3,8 +3,9 @@
 
   context 'correctly capture params' do
     before do
-      described_class.get('/spec/match/:id')   { "id"   }
-      described_class.get('/spec/match/:name') { "name" }
+      described_class.get('/spec/match/((?<id>\d+)|(?<owner_name>[^\/]+))', mustermann_opts: { type: :regexp }) do
+        params[:id] ? "id" : "name"
+      end
     end
 
     it 'matches :id with digits' do