RSpec supports a one-liner syntax for setting an expectation on the subject:

describe Array do
  describe "when first created" do
    it { should be_empty }
  end
end

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The example description "it should be empty" will be defined automatically.

With RSpec 3's expect-based syntax you use it_is_expected instead:

describe Array do
  describe "when first created" do
    it { is_expected.to be_empty }
  end
end