added tests for the thread_content action of comments controller

Author: Oaphi

test/controllers/comments/thread_content_test.rb

@@ -0,0 +1,23 @@
+require 'test_helper'
+require 'comments_test_helpers'
+
+class CommentsControllerTest < ActionController::TestCase
+  include Devise::Test::ControllerHelpers
+  include CommentsControllerTestHelpers
+
+  test 'should correctly get thread content' do
+    normal_two = comment_threads(:normal_two)
+
+    try_thread_content(normal_two)
+
+    assert_response(:success)
+    assert_not_nil assigns(:comment_thread)
+    assert_equal normal_two.updated_at, response.get_header('Last-Modified')
+  end
+
+  private
+
+  def try_thread_content(thread)
+    get :thread_content, params: { id: thread.id }
+  end
+end