如何在阻止之前"期望"改变rspec中的某些内容？

Question

我有一个以这种方式构建的测试套件:

let(:cat) { create :blue_russian_cat } 
subject { cat }

context "empty bowl" do
  let!(:bowl) { create(:big_bowl, amount: 0) }
  before { meow }

  # a ton of `its` or `it` which require `meow` to be executed before making assertion
  its(:status) { should == :annoyed }
  its(:tail) { should == :straight }
  # ...

  # here I want to expect that number of PetFishes is going down after `meow`, like that
  it "will eat some pet fishes" do
    expect {???}.to change(PetFish, :count).by(-1)
  end
end

通常我会把这个块放在上下文之外调用expect:

  it "will eat some pet fishes" do
    expect { meow }.to change(PetFish, :count).by(-1)
  end

但它使代码更难阅读,因为相关代码放在其上下文之外.

Answer 1

您是否会考虑将两个测试更改为expect语法以使它们处于相同的状态context？也许是这样的：

let(:cat) { create :blue_russian_cat } 

context "empty bowl" do
  let!(:bowl) { create(:big_bowl, amount: 0) }
  let(:meowing) { -> { meow } } # not sure what meow is, so may not need lambda

  it "will annoy the cat" do
    expect(meowing).to change(cat.status).from(:placid).to(:annoyed)
  end

  # here I want to expect that number of PetFishes is going down after `meow`
  it "will eat some pet fishes" do
    expect(meowing).to change(PetFish, :count).by(-1)
  end
end