rex/spec/book/trade_tracker_spec.rb

# frozen_string_literal: true

RSpec.describe Rex::Book::TradeTracker do
  let(:n) { 1 }
  subject(:instance) { described_class.new(limit: n) }

  before do
    instance.add(10)
    instance.add(11)
  end

  describe "#trades" do
    it "returns only the last n trades" do
      expect(instance.trades).to eq([11])
    end
  end

  describe "#each" do
    let(:n) { 3 }
    it "returns only the last n trades" do
      expect(instance.to_a).to eq([10, 11])
    end
  end
end