frankfurter/spec/quote/base_spec.rb

# frozen_string_literal: true

require_relative '../helper'
require 'quote/base'

module Quote
  describe Base do
    let(:klass) do
      Class.new(Base)
    end

    let(:quote) do
      klass.new(date: Date.today)
    end

    it 'requires data' do
      _ { quote.perform }.must_raise NotImplementedError
    end

    it 'does not know how to format result' do
      _ { quote.formatted }.must_raise NotImplementedError
    end

    it 'does not know how to generate a cache key' do
      _ { quote.cache_key }.must_raise NotImplementedError
    end

    it 'defaults base to Euro' do
      _(quote.base).must_equal 'EUR'
    end

    it 'defaults amount to 1' do
      _(quote.amount).must_equal 1
    end

    describe 'when given data' do
      before do
        def quote.fetch_data
          []
        end
      end

      it 'performs' do
        assert quote.perform
      end

      it 'performs only once' do
        quote.perform

        refute quote.perform
      end
    end

    describe 'when rebasing from an unavailable currency' do
      let(:date) do
        Date.parse('2000-01-01')
      end

      let(:quote) do
        klass.new(date:, base: 'ILS')
      end

      before do
        def quote.fetch_data
          [{ date:, iso_code: 'USD', rate: 1 }]
        end
      end

      it 'finds nothing' do
        quote.perform
        _(quote.not_found?).must_equal true
      end
    end

    describe 'when rebasing and converting to an unavailable currency' do
      let(:date) do
        Date.today
      end

      let(:quote) do
        klass.new(date:, base: 'USD', symbols: ['FOO'])
      end

      before do
        def quote.fetch_data
          [{ date:, iso_code: 'USD', rate: 1 }]
        end
      end

      it 'finds nothing' do
        quote.perform
        _(quote.not_found?).must_equal true
      end
    end
  end
end