RSpec中的賦值方法返回nil

Question

我正在使用mocks和stubs進行測試，但我一直在輸出中得到nil。我不確定這是否是分配方法的問題。我是否也可以知道我應該如何調試這種問題？我正在使用rspec-rails 3.5.2謝謝。

失敗測試：

describe 'guest user' do 
    describe 'GET index' do 
    let(:achievement) { instance_double(Achievement) } 

    before do 
     allow(Achievement).to receive(:get_public_achievements) { [achievement] } 
    end 

    it 'assigns public achievements to template' do 
     get :index 
     expect(assigns(achievement)).to eq([achievement]) 
    end 
    end 
end 

控制器中的索引動作

def index 
    @achievements = Achievement.get_public_achievements 
end 

的get_public_achievements在實現模型

def self.get_public_achievements 
    // empty method it's fine 
    end 

錯誤：

1) AchievementsController guest user GET index assigns public achievements to template 
Failure/Error: expect(assigns(achievement)).to eq([achievement]) 

    expected: [#<InstanceDouble(Achievement) (anonymous)>] 
     got: nil 

    (compared using ==) 

Answer 1

assigns以符號爲鍵。應該是

expect(assigns(:achievements)).to eq([achievement])