使用块会导致Rspec测试失败。

Question

我在使用Rspec中的前置块时遇到了一些问题。在下面的代码中，我无法删除allow(plane).to receive(:land_plane)行。在第二个代码块中，我也遇到了同样的问题，但是使用了allow(plane).to receive(:take_off_plane)。这里的任何帮助都将不胜感激！

describe '#land' do
    context 'when not stormy' do
      before :each do
        allow(airport.weather).to receive(:stormy_weather?).and_return(false)
        allow(plane).to receive(:land_plane)
      end
      it 'should tell the plane to land' do
        plane = double(:plane, airborne: true)
        allow(plane).to receive(:land_plane) # can't put this into before block?
        expect(airport).to receive(:land)
        airport.land(plane)
      end

      it 'should have plane in the Airport' do
        plane = double(:plane, airborne: true)
        allow(plane).to receive(:land_plane)
        airport.land(plane)
        expect(airport.planes_in_airport).to include plane
      end

      it 'should raise error when trying to land a landed plane' do
        plane = double(:plane, airborne: false)
        message = "This plane is already landed."
        expect{ airport.land(plane) }.to raise_error message
      end

      context 'when full' do
        it 'should raise an error' do
          plane = double(:plane, airborne: true)
          allow(plane).to receive(:land_plane)
          airport.capacity.times {airport.land(plane)}
          message = "Sorry. Airport full. Go away."
          expect{airport.land(plane)}.to raise_error message
        end
      end
    end

--

describe '#take_off' do
    context 'when not stormy'
    before do
      allow(airport.weather).to receive(:stormy_weather?).and_return(false)
      allow(plane).to receive(:take_off_plane)
    end
    it 'should remove plane from Airport' do
      plane = double(:plane, airborne: false)
      allow(plane).to receive(:take_off_plane) # can't delete this
      airport.planes_in_airport.push(plane)
      airport.take_off(plane)
      expect(airport.planes_in_airport).not_to include(plane)
    end
  end

Answer 1

我已经想出了答案。

这里的挑战是，我错误地在预期的范围内创造了新的双打。例如：

 it 'should have plane in the Airport' do
        plane = double(:plane, airborne: true)
        allow(plane).to receive(:land_plane)
        airport.land(plane)
        expect(airport.planes_in_airport).to include plane
      end

在这里，我不应该使用plane = double(:plane, airborne: true)行。或者，在这个问题上，也有那个allow(plane).to receive(:land_plane)在里面。我应该把这两个都放在前面的街区

我的前街区应该是这样的：

before :each do
      allow(plane).to receive(:airborne).and_return(true)
      allow(plane).to receive(:land_plane)
      allow(airport.weather).to receive(:stormy_weather?).and_return(false)
    end

这就不需要我在每一个期望中创建那些奇怪的双倍了。这也意味着飞机的空降状态是预定义的.这发生在我允许平面双机接收land_plane方法之前。在此之前，我这样做是错误的，这意味着我在告诉它接受land_plane方法之后创建了一个double，从而导致了一个意外的消息异常。

谢谢你看它，如果你还有其他的观点，请告诉我！