Question

Newb在这里......刚刚与rspec站在一起，并对以下内容提出疑问：

describe Song do

  before do
     @song = Song.new
  end

  describe 'title' do
    it 'should capitalize the first letter' do
      @song.title = "lucky"
      @song.title.should == "Lucky"
    end
end

我不确定如何满足“以前做......结束” 我看到它写在许多教程和rspec示例中，但我仍然失去了如何满足ruby代码，以便它将通过。感谢

Answer 1

RSpec起初可能会令人困惑，因为总有很多有效的方法可以实现相同的目标。这就是为什么我建议您通过“许多教程和示例”而不是（或之前）获得The Rspec Book。

我可以通过八种不同的方式轻松实现这一单一测试（参见下面的代码示例），您可以将它们的部分混合搭配得更多，从而产生更多不同的方法来解决同样的问题。

这就是为什么我认为在你能够完成示例和教程之前必须对RSpec原理有一个基本的了解 - 每个例子看起来会略有不同，但是如果你有基础知识，你很容易就能看到每个例子都做了什么。

require "rspec"

class Song
  def title=(title)
    @title = title
  end

  def title
    @title.capitalize
  end
end

describe Song do
  before { @song = Song.new }

  describe "#title" do
    it "should capitalize the first letter" do
      @song.title = "lucky"
      @song.title.should == "Lucky"
    end
  end
end

describe Song do
  describe "#title" do
    it "should capitalize the first letter" do
      song = Song.new
      song.title = "lucky"
      song.title.should == "Lucky"
    end
  end
end

describe Song do
  let(:song) { Song.new }

  describe "#title" do
    before { song.title = "lucky" }

    it "should capitalize the first letter" do
      song.title.should == "Lucky"
    end
  end
end

describe Song do
  let(:song)  { Song.new }
  subject     { song }

  before { song.title = "lucky" }

  its(:title) { should == "Lucky" }
end

describe Song do
  let(:song) { Song.new }

  describe "#title" do
    before { song.title = "lucky" }

    context "capitalization of the first letter" do
      subject { song.title }
      it { should == "Lucky" }
    end
  end
end

describe Song do
  context "#title" do
    before { subject.title = "lucky" }
    its(:title) { should == "Lucky" }
  end
end

RSpec::Matchers.define :be_capitalized do
  match do |actual|
    actual.capitalize == actual
  end
end

describe Song do
  context "#title" do
    before { subject.title = "lucky" }
    its(:title) { should be_capitalized }
  end
end

describe Song do
  let(:song) { Song.new }

  context "#title" do
    subject { song.title }
    before { song.title = "lucky" }
    it { should be_capitalized }
  end
end

rspec newb不了解如何满足“before”方法

1 个答案: