Error when I run bundle exec in terminal

When I run bundle exec rake test It comes up with an error in the terminal. It can't seem to get passed this step

Running:

.......EEE.......

Finished in 0.420936s, 40.3862 runs/s, 61.7672 assertions/s.

1) Error: StaticPagesControllerTest#test_should_get_help: NameError: uninitialized constant ApplicationController::TestCase app/controllers/static_pages_controller.rb:1:in `'

2) Error: StaticPagesControllerTest#test_should_get_home: NameError: uninitialized constant ApplicationController::TestCase app/controllers/static_pages_controller.rb:1:in `'

3) Error: StaticPagesControllerTest#test_should_get_about: NameError: uninitialized constant ApplicationController::TestCase app/controllers/static_pages_controller.rb:1:in `'

17 runs, 26 assertions, 0 failures, 3 errors, 0 skips

I tried fixing the problem to the code but have not come up with a solution.

class StaticPagesControllerTest < ActionController::TestCase

test "should get home" do get :home assert_response :success assert_select "title", "Home | Ruby on Rails Tutorial Sample App" end

test "should get help" do get :help assert_response :success assert_select "title", "Help | Ruby on Rails Tutorial Sample App" end

test "should get about" do get :about assert_response :success assert_select "title", "About | Ruby on Rails Tutorial Sample App"

end

end