Can 'mongoid-minitest' gem be used for writing controller test cases?

I am using 'mongoid-minitest' for writing test suite for my app I have successfully added test cases for models using this gem. I tried adding controller test cases.

users_controller_test.rb

  require 'test_helper'
  describe UsersController do
    describe '#index' do
      it 'render index view' do
        get :index 
      end
    end
  end

But running command ruby -I test test/controllers/users_controller_test.rb is throwing error: undefined method 'get' for #<#<Class:0x00000006592e68>:0x00000007a7d9b8> when get :index is executed.