Add test

Author: blake

spec/openapi_3/nicknamed_openapi_3_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'a nicknamed mounted api' do
+  def app
+    Class.new(Grape::API) do
+      desc 'Show this endpoint', nickname: 'simple'
+      get '/simple' do
+        { foo: 'bar' }
+      end
+
+      add_swagger_documentation openapi_version: '3.0', format: :json
+    end
+  end
+
+  subject do
+    get '/swagger_doc.json'
+    JSON.parse(last_response.body)
+  end
+
+  it 'uses the nickname as the operationId' do
+    expect(subject['paths']['/simple']['get']['operationId']).to eql('simple')
+  end
+end