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 = ["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