spec: bit less code duplication

spec/controllers/ajax/answer_controller_spec.rb

@@ -3,13 +3,7 @@
 
 require "rails_helper"
 
-describe Ajax::AnswerController, type: :controller do
-  shared_examples "returns the expected response" do
-    it "returns the expected response" do
-      expect(JSON.parse(subject.body)).to match(expected_response)
-    end
-  end
-
+describe Ajax::AnswerController, :ajax_controller, type: :controller do
   let(:user) { FactoryBot.create(:user) }
   let(:question) { FactoryBot.create(:question, user: FactoryBot.build(:user, privacy_allow_stranger_answers: asker_allows_strangers)) }
   let(:asker_allows_strangers) { true }

spec/controllers/ajax/comment_controller_spec.rb

@@ -3,13 +3,7 @@
 
 require "rails_helper"
 
-describe Ajax::CommentController, type: :controller do
-  shared_examples "returns the expected response" do
-    it "returns the expected response" do
-      expect(JSON.parse(subject.body)).to match(expected_response)
-    end
-  end
-
+describe Ajax::CommentController, :ajax_controller, type: :controller do
   let(:user) { FactoryBot.create(:user) }
   let(:answer) { FactoryBot.create(:answer, user: FactoryBot.create(:user)) }
 

spec/controllers/ajax/smile_controller_spec.rb

@@ -3,13 +3,7 @@
 
 require "rails_helper"
 
-describe Ajax::SmileController, type: :controller do
-  shared_examples "returns the expected response" do
-    it "returns the expected response" do
-      expect(JSON.parse(subject.body)).to match(expected_response)
-    end
-  end
-
+describe Ajax::SmileController, :ajax_controller, type: :controller do
   let(:user) { FactoryBot.create(:user) }
 
   describe "#create" do

spec/shared_examples/ajax_controllers.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+RSpec.shared_context "AjaxController context" do
+  shared_examples "returns the expected response" do
+    it "returns the expected response" do
+      expect(JSON.parse(subject.body)).to match(expected_response)
+    end
+  end
+end
+
+RSpec.configure do |c|
+  c.include_context "AjaxController context", ajax_controller: true
+end