Add game admin page test
user
```ruby
# frozen_string_literal: true

require 'rails_helper'

RSpec.feature 'Admin::Games', level: :feature do
  let(:admin) { create(:admin_user) }
  let(:game) { create(:game) }

  before { sign_in admin }

  describe '#index' do
    before do
      @games = create_list(:game, 5)
    end

    it 'can see all game' do
      visit admin_games_path
      @games.each { |game| expect(page).to have_content(game.name) }
    end
  end

  describe '#new' do
    it 'can add new game' do
      visit new_admin_game_path
      fill_in 'game_name', with: 'Example'
      fill_in 'game_description', with: 'Example Description'
      fill_in 'game_team', with: 'Team'
      attach_file(
        'game_thumbnail',
        Rails.root.join('spec', 'support', 'brands', 'logos', 'TGDF.png')
      )
      click_button '新增Game'
      expect(page).to have_content('Example')
    end
  end

  describe '#edit' do
    it 'can edit game' do
      visit edit_admin_game_path(game)
      fill_in 'game_name', with: 'New Game Name'
      click_button '更新Game'
      expect(page).to have_content('New Game Name')
    end
  end

  describe '#destroy' do
    before { @game = create(:game) }

    it 'can destroy game' do
      visit admin_games_path

      within first('td', text: @game.name).first(:xpath, './/..') do
        click_on 'Destroy'
      end

      expect(page).not_to have_content(@game.name)
    end
  end
end
```
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