關於單元測試的建議rspec

Question

你如何用rspec測試這個方法？

def schema 
    @schema ||= Schema.new(owner, schedules, hour_interval) 
end 

Answer 1

如果覺得傾向於問「是什麼？你嘗試測試它」，但這裏是我的答案呢：如果你在RSpec的單元測試，你定義方法是你的單位，我會建議測試它是這樣的：

describe "schema" do 
    let(:owner) { mock('owner') } 
    let(:schedules) { mock('schedules') } 
    let(:hour_interval) { mock('hour_interval') } 
    let(:schema) { mock('schema') } 
    before(:each) do 
    subject.stub! :owner => owner, :schedules => schedules, :hour_interval => hour_interval 
    end 
    context "unmemoized" do 
    it "should instantiate a new schema" do 
     Schema.should_receive(:new).with(owner, schedules, hour_interval).and_return schema 
     subject.schema.should == schema 
    end 
    end 
    context "memoized" do 
    it "should use the instantiated and memoized schema" do 
     Schema.should_receive(:new).with(owner, schedules, hour_interval).once.and_return schema 
     2.times do 
     subject.schema.should == schema 
     end 
    end 
    end 
end 

這樣，你測試的單位和所有它在隔離。

有關詳細說明，請參閱The RSpec Documentation和/或Best RSpec Practices