frankfurter/spec/currency_spec.rb

# frozen_string_literal: true

require_relative 'helper'
require 'currency'
require 'minitest/autorun'

describe Currency do
  describe '.latest' do
    it 'returns latest rates' do
      data = Currency.latest.all
      _(data.count).must_be :>, 1
    end
  end

  describe '.between' do
    let(:day) do
      Date.parse('2010-01-01')
    end

    it 'returns everything up to a year' do
      interval = day..day + 365
      _(Currency.between(interval).map(:date).uniq.count).must_be :>, 52
    end

    it 'samples weekly over a year' do
      interval = day..day + 366
      _(Currency.between(interval).map(:date).uniq.count).must_be :<, 54
    end

    it 'sorts by date when sampling' do
      interval = day..day + 366
      dates = Currency.between(interval).map(:date)
      _(dates).must_equal dates.sort
    end
  end

  describe '.only' do
    it 'filters symbols' do
      iso_codes = %w[CAD USD]
      data = Currency.latest.only(*iso_codes).all
      _(data.map(&:iso_code).sort).must_equal iso_codes
    end

    it 'returns nothing if no matches' do
      _(Currency.only('FOO').all).must_be_empty
    end
  end
end