Source examples for blog on explicit use of subject

example-1.rb

describe Article do
  it { should validate_presence_of(:title) }
end

example-2.rb

describe Article do
  it "validates presence of :title" do
    article = Article.new
    article.should validate_presence_of(:title)
  end
end

example-3.rb

describe Article do
  subject { Article.new }
  # ...

example-4.rb

  # ...
  it "validates presence of :title" do
    subject.should validate_presence_of(:title)
  end
end

example-5.rb

# not recommended
describe Article do
  subject { Article.new }

  it "validates presence of :title" do
    subject.should validate_presence_of(:title)
  end
end

example-6.rb

describe Article do
  def article; Article.new; end

  it "validates presence of :title" do
    article.should validate_presence_of(:title)
  end
end

example-7.rb

# refactoring toward implicit step 1
describe Article do
  it "validates presence of :title" do
    subject.should validate_presence_of(:title)
  end
end

example-8.rb

# refactoring toward implicit step 2
describe Article do
  it "validates presence of :title" do
    should validate_presence_of(:title)
  end
end

example-9.rb

describe Article do
  subject { Article.new :title => "Lorem ipsum" }

  it "has a title" do
    subject.title.should eq("Lorem ipsum")
  end
end