shared_examples.rb

RSpec.shared_examples "investments value interface" do
  it { expect(subject).to respond_to(:principal_invested) }
  it { expect(subject).to respond_to(:generated_value) }
  it { expect(subject).to respond_to(:current_value) }
  it { expect(subject).to respond_to(:has_current_value_with_adjustment?) }
  it { expect(subject).to respond_to(:value_of_received_payments) }
  it { expect(subject).to respond_to(:count_of_received_payments) }
end