Question

我的控制器中有一个方法，取消保留，调用find_ticket方法，如果找到了票证，则在票证上调用unreserve。

  def unreserve
    if find_ticket
      @ticket.unreserve current_or_guest_user
      render json: @ticket.show.tickets_as_json(current_or_guest_user)
    else
      render json: nil
    end
  end

  private

  def find_ticket
    @ticket = Ticket.find params[:id]
    rescue ActiveRecord::RecordNotFound
      false
  else
    true
  end

由于我已经测试了unreserve，我只想确保调用该方法。所以当我尝试运行这个规范时：

describe 'unreserving a ticket' do
  before :each do
    sign_in customer
    put :reserve, id: ticket_1.id
    put :unreserve, id: ticket_1.id
  end
  it 'calls unreserve on the ticket with the current user' do
    expect(controller.instance_variable_get :@ticket).to receive(:unreserve)
  end
end

我希望通过，我甚至在puts方法中抛出unreserve语句以确保调用该方法，并在运行测试时将其输出到控制台。

我从测试中得到的输出是：

1) TicketsController unreserving a ticket calls unreserve on the ticket with the current user
     Failure/Error: expect(controller.instance_variable_get :@ticket).to receive(:unreserve)
       (#<Ticket:0x007f90dd6c9600>).unreserve(*(any args))
           expected: 1 time with any arguments
           received: 0 times with any arguments

编辑：

我尝试在操作之前调用expect语句，但仍然遇到了同样的错误。这是新的测试：

it 'calls unreserve on the ticket with the current user' do
    expect(controller.instance_variable_get :@ticket).to receive(:unreserve)
    sign_in customer
    put :reserve, id: ticket_1.id
    put :unreserve, id: ticket_1.id
  end

Answer 1

除非我记得错误，否则您需要在提出要求之前提出您的期望。意思是你不能使用前块（不完全是）。在您的put :unreserve电话之后移动expect，如下所示：

describe 'unreserving a ticket' do
  before :each do
    sign_in customer
    put :reserve, id: ticket_1.id
  end
  it 'calls unreserve on the ticket with the current user' do
    expect(controller.instance_variable_get :@ticket).to receive(:unreserve)
    put :unreserve, id: ticket_1.id
  end
end

RSpec测试方法调用实例变量不通过

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