Test without explicit it descriptions.

gistfile1.rb

describe "#update" do
  subject { response }

  let(:attributes) { stub('attributes') }

  def do_put
    put :update, :id => user.id, :user => attributes, :format => format
  end

  def expect_user_update_attributes_and_return(result)
    User.any_instance.expects(:update_attributes).with(attributes).returns(result)
  end

  context "html" do
    let(:format) { :html }

    context 'with valid attributes' do
      before do
        expect_user_update_attributes_and_return(true)
        do_put
      end

      it { should redirect_to(edit_user_path) }
    end

    context 'with invalid attributes' do
      before do
        expect_user_update_attributes_and_return(false)
        do_put
      end

      it { should render_template(:edit) }
    end
  end

  context "json" do
    let(:format) { :json }

    context 'with valid attributes' do
      before do
        expect_user_update_attributes_and_return(true)
        do_put
      end

      it { should be_success }

      describe 'returned json' do
        subject { JSON.parse(response.body) }

        it { subject['id'].should == user.id }
        it { subject['email'].should == user.email }
      end
    end

    context 'with invalid attributes' do
      before do
        expect_user_update_attributes_and_return(false)
        do_put
      end

      it { should be_unprocessable_entity }
    end
  end
end