have.rb

def available_if_enough_info
    if self.available? || self.display_only?
      if self.can_be_available?
        self.available!
      else
        self.display_only!
      end
    end
  end

have_spec_a.rb

  describe "#available_if_enough_info" do
    let(:have) { FactoryGirl.build_stubbed(:have, status: status) }

    shared_examples_for "available and display only haves" do
      let(:can_be_available?) { true }

      before(:each) do
        have.stubs(:can_be_available?).returns(can_be_available?)
        have.available_if_enough_info
      end

      context "can't be available" do
        let(:can_be_available?) { false }

        it "marks the have as display only" do
          have.display_only?.should be_true
        end
      end

      context "can be available" do
        it "marks the have as available" do
          have.available?.should be_true
        end
      end
    end

    context "status is available" do
      let(:status) { :available }

      it_behaves_like "available and display only haves"
    end

    context "status is display only" do
      let(:status) { :display_only }

      it_behaves_like "available and display only haves"
    end

    context "status is something else" do
      let(:status) { :pending }

      it "doesn't change the status" do
        have.available_if_enough_info

        have.status.should == status
      end
    end
  end

have_spec_b.rb

describe "#available_if_enough_info" do
    let(:have) { FactoryGirl.build_stubbed(:have, status: status) }

    shared_examples_for "available and display-only haves" do
      it "marks the have as display only when it can't be available" do
        have.stubs(can_be_available?: false)

        have.available_if_enough_info

        have.display_only?.should be_true
      end

      it "marks the have as available when it can be available" do
        have.stubs(can_be_available?: true)

        have.available_if_enough_info

        have.available?.should be_true
      end
    end

    context "status is available" do
      let(:status) { :available }

      it_behaves_like "available and display-only haves"
    end

    context "status is display only" do
      let(:status) { :display_only }

      it_behaves_like "available and display-only haves"
    end

    context "status is something else" do
      let(:status) { :pending }

      it "doesn't change the status" do
        have.available_if_enough_info

        have.status.should == status
      end
    end
  end