rspec/datamapper - 如何告訴rspec期望出現錯誤？

Question

我目前在西納特拉/ DataMapper的

class Score 
include DataMapper::Resource 

property :score, Integer 

property :created_at, DateTime, :default => DateTime.now, :lazy => [:show] 
property :updated_at, DateTime, :default => DateTime.now, :lazy => [:show] 

belongs_to :pageant, :key => true 
belongs_to :candidate, :key => true 
belongs_to :category, :key => true 
belongs_to :judge, :key => true 

end 

測試該類這個RSpec的測試

it 'that can be inserted by a judge if a pageant is active' do 
     score_count = Score.all.length 
     post '/score', @correct_score_data 
     Score.all.length.should eq score_count+1 
    end 

    it 'cannot be duplicated if it has been sent' do 
     score_count = Score.all.length 
     post '/score', @correct_score_data 
     Score.all.length.should eq score_count 
    end 

基本上什麼是應該發生的是，法官只能發送一個得分特定類別+候選人+選美組合一次，之後我想否認下一個分數。現在，當我運行這個時，我得到一個IntegrityError（我期望）。我如何告訴rspec我「期望看到這個錯誤」？你們也可以批評我的代碼，我仍然在學習所有這些一起

Answer 1

使用expect{}.to raise_error：https://www.relishapp.com/rspec/rspec-expectations/v/2-6/docs/built-in-matchers/raise-error-matcher

我不完全理解你的規格（它看起來像你的應用程序狀態是由兩個測試之間泄漏），但這樣的事情...

it 'cannot be duplicated if it has been sent' do 
    score_count = Score.all.length 
    expect { post '/score', @correct_score_data }.to raise_error(IntegrityError) 
end