frankfurter/spec/roundable_spec.rb

# frozen_string_literal: true

require_relative 'helper'
require 'roundable'

describe Roundable do
  include Roundable

  it 'rounds values over 5,000 to zero decimal places' do
    _(round(5000.123456)).must_equal 5000
  end

  it 'rounds values over 80 and below 5,000 to two decimal places' do
    _(round(80.123456)).must_equal 80.12
    _(round(4999.123456)).must_equal 4999.12
  end

  it 'rounds values over 20 and below 80 to three decimal places' do
    _(round(79.123456)).must_equal 79.123
    _(round(20.123456)).must_equal 20.123
  end

  it 'rounds values over 1 and below 20 to four decimal places' do
    _(round(19.123456)).must_equal 19.1235
    _(round(1.123456)).must_equal 1.1235
  end

  it 'rounds values below 1 to five decimal places' do
    _(round(0.123456)).must_equal 0.12346
  end

  it 'rounds values below 0.0001 to six decimal places' do
    _(round(0.0000655)).must_equal 0.000066
  end

  it 'conforms to ECB conventions' do
    skip "We don't conform ¯_(ツ)_/¯"
    require 'day'
    rates = Day.all.sample.rates.to_a
    rates.shuffle.each_value do |rate|
      _(round(rate)).must_equal rate
    end
  end
end