Ruby on rails RSpec,如何在模块内测试初始化
我有这个模块:Ruby on rails RSpec,如何在模块内测试初始化,ruby-on-rails,rspec,Ruby On Rails,Rspec,我有这个模块: module TicketsPresenters class ShowPresenter def initialize(ticket_or_id = nil) unless ticket_or_id.nil? if ticket_or_id.is_a?(Ticket) @ticket = ticket_or_id else @ticket = Ticket
module TicketsPresenters
class ShowPresenter
def initialize(ticket_or_id = nil)
unless ticket_or_id.nil?
if ticket_or_id.is_a?(Ticket)
@ticket = ticket_or_id
else
@ticket = Ticket.find(ticket_or_id)
end
end
end
end
当我传递整数或直接传递对象实例时,我想测试initialize()方法是否正确设置了对象。可能有十几种方法可以回答这个问题,但我会给出我喜欢的RSpec格式 以下假设您在ShowPresenter类中有一个用于ticket的reader方法(即attr\u reader:ticket)。它还假设您正在使用有效参数创建票证对象,以便保存它
describe TicketsPresenters::ShowPresenter do
context '#initialize' do
let!(:ticket) { Ticket.create!(...) }
context 'with an id' do
subject { TicketsPresenters::ShowPresenter.new(ticket.id) }
its(:ticket) { should == ticket }
end
context 'with a Ticket object' do
subject { TicketsPresenters::ShowPresenter.new(ticket) }
its(:ticket) { should == ticket }
end
context 'with nothing' do
subject { TicketsPresenters::ShowPresenter.new }
its(:ticket) { should be_nil }
end
end
end
注意:我是的粉丝,所以我个人更喜欢使用Factory.create(:ticket)
而不是ticket.create!(…)
因为它允许您在一个位置定义一个有效的票证对象,并且如果该定义发生更改,您不需要在所有测试中更新它
人们采取的另一个测试立场是根本不使用数据库持久性。这可能不是我向Ruby或RSpec新手建议的概念,因为它更难解释,需要更多的OOP知识。好处是它消除了数据库依赖性,并且测试更快、更隔离
describe TicketsPresenters::ShowPresenter do
context '#initialize' do
let(:ticket) { mock(:ticket, id: 1) }
before do
ticket.stub(:is_a?).with(Ticket) { true }
Ticket.stub(:find).with(ticket.id) { ticket }
end
context 'with an id' do
subject { TicketsPresenters::ShowPresenter.new(ticket.id) }
its(:ticket) { should == ticket }
end
context 'with a Ticket object' do
subject { TicketsPresenters::ShowPresenter.new(ticket) }
its(:ticket) { should == ticket }
end
context 'with nothing' do
subject { TicketsPresenters::ShowPresenter.new }
its(:ticket) { should be_nil }
end
end
end
我的建议是,您不提供传递票证id或票证对象的功能。如果您在初始化演示者时拥有该id,那么只需实例化ticket对象并始终将其传入即可。不需要增加复杂性。