摩卡最多预期一次,调用两次,但方法显然只被调用一次

时间:2013-05-01 23:29:22

标签: ruby testing mocking mocha expectations

我正在使用Mocha进行模拟测试。以下是相关代码:

# test_player.rb
should "not download the ppg more than once for a given year" do
  @durant.expects(:fetch_points_per_game).at_most_once
  ppg = @durant.points_per_game
  ppg2= @durant.points_per_game
  assert_equal ppg, ppg2, "A player should have a points per game"
end

# player.rb
class Player
  # ...

  def points_per_game(year=Date.today.year)
    @points_per_game ||= fetch_points_per_game(year)
  end
  alias_method :ppg, :points_per_game

  private

  def fetch_points_per_game(year=Date.today.year)
    31.2
  end
end

测试失败,抱怨有“意外调用:#。find_points_per_game(any_parameters)”

我对我的代码的理解是,如果@point_per_game为nil,将调用fetch_points_per_game,否则,结果将被缓存,以便将来调用points_per_game。那么为什么测试抱怨fetch_points_per_game被调用两次?

1 个答案:

答案 0 :(得分:1)

在您的期望中,您没有指定返回值,因此存根调用返回nil。这就是它第二次被召唤的原因。如果您将期望更改为:

@durant.expects(:fetch_points_per_game).at_most_once.returns(1.23)

您应该会发现测试现在通过了。