diff --git a/rswag-specs/lib/rswag/route_parser.rb b/rswag-specs/lib/rswag/route_parser.rb
index 03470ee..4689203 100644
--- a/rswag-specs/lib/rswag/route_parser.rb
+++ b/rswag-specs/lib/rswag/route_parser.rb
@@ -11,7 +11,7 @@ module Rswag
     def routes
       ::Rails.application.routes.routes.select do |route|
         route.defaults[:controller] == controller
-      end.each_with_object({}) do |tree, route|
+      end.each_with_object({}) do |route, tree|
         path = path_from(route)
         verb = verb_from(route)
         tree[path] ||= { params: params_from(route), actions: {} }
diff --git a/rswag-specs/spec/rswag/route_parser_spec.rb b/rswag-specs/spec/rswag/route_parser_spec.rb
new file mode 100644
index 0000000..38628a5
--- /dev/null
+++ b/rswag-specs/spec/rswag/route_parser_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+RSpec.describe Rswag::RouteParser do
+  describe "#routes" do
+    let(:controller) { "api/v1/posts" }
+    subject { described_class.new(controller) }
+
+    let(:routes) do
+      [
+        double(
+          defaults: {
+            controller: controller
+          },
+          path: double(
+            spec: double(
+              to_s: "/api/v1/posts/:id(.:format)"
+            )
+          ),
+          verb: "GET",
+          requirements: {
+            action: "show",
+            controller: "api/v1/posts"
+          },
+          segments: ["id", "format"]
+        )  
+      ]
+    end
+
+    let(:expectation) do
+      {
+        "/api/v1/posts/{id}" => { 
+          params: ["id"],
+          actions: {
+            "get" => {
+              summary: "show post"
+            }
+          }
+        }
+      }
+    end
+
+    before do
+      allow(::Rails).to receive_message_chain("application.routes.routes") { routes }
+    end
+
+    it "returns correct routes" do
+      expect(subject.routes).to eq(expectation)
+    end
+  end
+end