I'm trying to test an elevator simulator program that runs in the console and requires user interaction. At the moment, my tests look like this:

gem 'minitest', '>= 5.0.0'
require 'minitest/spec'
require 'minitest/autorun'
require_relative 'elevator'

class SingleFloorElevator < Elevator
  @@moves = ["2", "N"].each
  def get_input; @@moves.next end
end

class MultiFloorElevator < Elevator
  @@moves = ["2", "Y", "7", "Y", "4", "N"].each
  def get_input; @@moves.next end
end

class InvalidElevetorOne < Elevator
  @@moves = ["-2", "2"].each
  def get_input; @@moves.next end
end

class InvalidElevatorTwo < Elevator
  @@moves = ["2000", "5"].each
  def get_input; @@moves.next end
end

class ElevatorTest < MiniTest::Test
  def test_can_accept_and_move_to_floor
    e = SingleFloorElevator.new
    e.run
    assert_equal(e.current_floor, 2)
  end

  def test_can_change_direction
    e = MultiFloorElevator.new
    e.run
    assert_equal(e.going_down, true)
    assert_equal(e.going_up, false)
  end

  describe "it can maintain a list of floor numbers" do
    it "cannot travel below the ground floor" do
      e = InvalidElevetorOne.new
      e.enter_floor
      assert_equal(e.floors.size, 1)
      assert_equal(e.floors, [2])
    end

    it "cannot travel higher than the top floor" do
      e = InvalidElevatorTwo.new
      e.enter_floor
      assert_equal(e.floors.size, 1)
      assert_equal(e.floors, [5])
    end
  end
end

As you can see, I'm overriding the Elevator class (more important the get_input method which grabs user input from the console) multiple times according to what I need to test. It all works perfectly fine but I was wondering if there was a tidier way of doing things?