change request to use the /links path, to fit more into a RESTful API

format

+ also renamed the test to better describe the behavior

spec/create_spec.rb

@@ -13,15 +13,16 @@ end
 
 describe "Submit API request to create new link" do
   include Rack::Test::Methods
-  it "should return link data in json format" do
+  it "should return link data in json format when a valid url is entered" do
     data = {
       url: 'http://google.com'
     }
-    post('/create', data.to_json, "CONTENT_TYPE" => "application/json")
+    post('/links', data.to_json, "CONTENT_TYPE" => "application/json")
     expect(last_response).to be_ok
     response_json = JSON.parse(last_response.body)
     expect(response_json['url']).to eq(data[:url])
     expect(response_json['code']).not_to eq(nil)
+    expect(response_json['link']).to include(response_json['code'])
   end
 end