Add specs for /parks/:code

config/routes.rb

@@ -1,7 +1,7 @@
 Rails.application.routes.draw do
   namespace :api do
     namespace :v1 do
-      resources :parks, only: %i[index]
+      resources :parks, only: %i[index show], param: :code
     end
   end
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html

spec/requests/api/v1/parks_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe "Api::V1::Parks", type: :request do
-  describe "GET /index" do
+  describe "GET /parks" do
     it "returns parks" do
       get api_v1_parks_url
       expect(response).to have_http_status(:success)
@@ -34,4 +34,21 @@ RSpec.describe "Api::V1::Parks", type: :request do
       end
     end
   end
+
+  describe "GET /parks/:code" do
+    it "returns :not_found for unknown codes" do
+      get api_v1_park_url("foo")
+      expect(response).to have_http_status(:not_found)
+    end
+
+    it "returns the park" do
+      get api_v1_park_url("crla")
+      expect(response).to have_http_status(:success)
+      expect(response.parsed_body).to match(
+        hash_including(
+          code: "crla", name: "Crater Lake National Park", states: "OR"
+        )
+      )
+    end
+  end
 end