More source examples for blog on explicit use of subject

example-10.rb

describe Article do
  def article; Article.new :title => "Lorem ipsum"; end

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

example-11.rb

describe Article do
  it "has a title" do
    article = Article.new :title => "Lorem ipsum"
    article.title.should eq("Lorem ipsum")
  end
end

example-12.rb

# before
shared_exmamples_for "an auditable object" do
  it "creates an audit record on save!" do
    lambda { subject.save! }.should change(Audit, :count).by(1)
  end
end

describe Person do
  it_behaves_like "an auditable object" do
    subject { Person.new :name => "David" }
  end
end

# after
shared_exmamples_for "an auditable object" do
  it "creates an audit record on save!" do
    lambda { auditable.save! }.should change(Audit, :count).by(1)
    #        ^ ^ ^ ^ ^
  end
end

describe Person do
  it_behaves_like "an auditable object" do
    def auditable; Person.new :name => "David"; end
    #   ^ ^ ^ ^ ^
  end
end

example-13.rb

describe AmericanCitizen do
  context "18 years of age" do
    subject { Person.new(:birthdate => 18.years.ago) }
    it { should     be_able_to(:vote)   }
    it { should     be_able_to(:enlist) }
    it { should_not be_able_to(:drink)  } # srsly?
  end
end

example-14.rb

describe CheckingAccount, "with a non-zero starting balance" do
  subject(:account) { CheckingAccount.new(Money.new(50, :USD)) }
  it { should_not be_overdrawn }
  it "has a balance equal to the starting balance" do
    account.balance.should eq(Money.new(50, :USD))
  end
end