Add problem calendar route and empty controller files

Author: phrdang

src/snapshots-app/app/controllers/api/problem_calendar_controller.rb

@@ -0,0 +1,2 @@
+class Api::ProblemCalendarController < ApplicationController
+end

src/snapshots-app/app/helpers/api/problem_calendar_helper.rb

@@ -0,0 +1,2 @@
+module Api::ProblemCalendarHelper
+end

src/snapshots-app/config/routes.rb

@@ -21,6 +21,7 @@
     get "backup_file_metadata/:course_id/:assignment_id/:user_id", to: "backup_file_metadata#show"
     get "summary_statistics/:course_id/:assignment_id/:user_id", to: "summary_statistics#show"
     get "problem_timeline/:course_id/:assignment_id/:user_id", to: "problem_timeline#show"
+    get "problem_calendar/:course_id/:assignment_id/:user_id", to: "problem_calendar#show"
 
     namespace :debugging, defaults: { format: :json } do
       get "autograder_spam/:course_id/:assignment_id/:user_id", to: "autograder_spam#show"

src/snapshots-app/test/controllers/api/problem_calendar_controller_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class Api::ProblemCalendarControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end