TypeError: superclass mismatch for class UsersController

tsheets_users_controller.rb

#file: app/controllers/tsheets/users_controller.rb

module Tsheets
  class UsersController < ApplicationController
    def update
      # does something important here
      render json: 'test: test'
    end
  end
end

tsheets_users_controller_test.rb

# file: test/controller/tsheets_users_controller_test.rb

require 'test_helper'
require_relative '../../app/controllers/tsheets/users_controller'

class Tsheets::UsersController < ActionController::TestCase
  setup do
    @user = users(:one)
    sign_in(@user)
  end

  test "#update" do
    get :update, format: :json
    assert_response :success
  end
end

users_controller.rb

# file: app/controllers/users_controller.rb

class UsersController < ApplicationController
  def index
  end

  def show
  end
end

Error I received then running this test.

TypeError: superclass mismatch for class UsersController
/Users/sk/client/Service_Phase_1/test/controllers/tsheets_users_controller_test.rb:4:in `<top (required)>'

i have a same error , can you please tell me the solution