如何使用 RSpec 的 an_instance_of 匹配器

Question

目前尚不清楚为什么以下规范失败。如果我将 an_instance_of 更改为 everything() 匹配器，则规范将通过。是我使用方法不正确吗？

controller.should_receive(:authorize!).with(:show, an_instance_of(Network))
get :new


Failure/Error: get :new
       #<AffiliationsController:0x007ff5c607f238> received :authorize! with unexpected arguments
         expected: (:show, #<RSpec::Mocks::ArgumentMatchers::InstanceOf:0x007ff5c6081600 @klass=Network(id: integer, creator_id: integer, name: string, zipcode: string, created_at: datetime, updated_at: datetime, allows_invitations: boolean, network_type_id: integer, active: boolean, fee: decimal, invitation_standard_text: text, description: text)>)
              got: (:show, Network(id: integer, creator_id: integer, name: string, zipcode: string, created_at: datetime, updated_at: datetime, allows_invitations: boolean, network_type_id: integer, active: boolean, fee: decimal, invitation_standard_text: text, description: text))

我正在尝试测试控制器是否正在调用 CanCan 的 load_and_authorize_resource 方法。理想情况下，我对这一发现抱有期望，但无法让它发挥作用。像这样的东西：

network = stub
Network.should_receive(:new).and_return(stub)
controller.should_receive(:authorize!).with(:show, network)

Answer 1

看起来它正在接收带有实际 Network 类的消息，而不是它的实例。