Issue #7083 has been updated by mghomn (Justin Peal).


You are awsome!
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Bug #7083: Why I cannot pass the test?
https://bugs.ruby-lang.org/issues/7083#change-34459

Author: mghomn (Justin Peal)
Status: Third Party's Issue
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.3p194 (2012-04-20) [i386-mingw32]


=== Program ===
#!/usr/bin/env ruby -w
# encoding: utf-8

require 'test/unit'

class Currency
  attr_reader :currency, :decimal_digits

  def initialize currency, decimal_digits
    @currency, @decimal_digits = currency, decimal_digits
  end
end

class Money
  attr_reader :hashy

  def initialize hashy
    @hashy = hashy
    clean()
  end

  def == other
    @hashy == other.hashy
  end

  def -@
    @hashy.each_pair do |currency, amount|
      @hashy[currency] = -amount
    end
    clean()
  end

  def + other
    @hashy.merge!(other.hashy) do |currency, old_amount, new_amount|
      old_amount.to_f + new_amount.to_f
    end
    clean()
  end

  def - other
    @hashy.merge!(other.hashy) do |currency, old_amount, new_amount|
      old_amount.to_f - new_amount.to_f
    end
    clean()
  end

  def * times
    @hashy.each_pair do |currency, amount|
      @hashy[currency] *= times
    end
    clean()
  end

  def / times
    @hashy.each_pair do |currency, amount|
      @hashy[currency] /= times
    end
    clean()
  end

  def clean
    @hashy.each_pair do |currency, amount|
      amount_new = amount.to_f.round(currency.decimal_digits)
      case
      when amount_new == 0.0
        @hashy.delete(currency)
      when amount_new != amount
        @hashy[currency] = amount_new
      end
    end
    self
  end
end

class MoneyTest < Test::Unit::TestCase
  def test_add
    usd = Currency.new(:USD, 2)
    cny = Currency.new(:CNY, 2)
    eur = Currency.new(:EUR, 2)
    jpy = Currency.new(:JPY, 0)
    gbp = Currency.new(:GBP, 2)

    assert_equal(Money.new(eur=>367.85, cny=>-337.19, jpy=>42289), Money.new(eur=>867.02, cny=>-794.75, jpy=>99675) / 2.357)
    assert_equal(Money.new(cny=>1576.56, gbp=>752.26, jpy=>64174), Money.new(cny=>861.51, gbp=>411.07, jpy=>35068) * 1.83)
    assert_equal(Money.new(usd=>367.04, cny=>418.27, eur=>728.18), Money.new(cny=>418.27, usd=>129.66) + Money.new(usd=>237.38, eur=>728.18))
    assert_equal(Money.new(eur=>211.32, cny=>-980.95, jpy=>31647), -Money.new(eur=>-211.32, cny=>980.95, jpy=>-31647))
    assert_equal(Money.new(jpy=>19627, usd=>442.39, gbp=>-393.84), Money.new(jpy=>19627, usd=>908.64) - Money.new(usd=>466.25, gbp=>393.84))
  end
end
=== Result ===
Run options:

# Running tests:

F

Finished tests in 0.029999s, 33.3344 tests/s, 166.6722 assertions/s.

  1) Failure:
test_add(MoneyTest) [C:/R/tst2.rb:87]:
<#<Money:0x1b463f8
 @hashy=
  {#<Currency:0x1b56148 @currency=:JPY, @decimal_digits=0>=>19627,
   #<Currency:0x1b561f0 @currency=:USD, @decimal_digits=2>=>442.39,
   #<Currency:0x1b560b8 @currency=:GBP, @decimal_digits=2>=>-393.84}>> expected
but was
<#<Money:0x1b462f0
 @hashy=
  {#<Currency:0x1b56148 @currency=:JPY, @decimal_digits=0>=>19627,
   #<Currency:0x1b561f0 @currency=:USD, @decimal_digits=2>=>442.39,
   #<Currency:0x1b560b8 @currency=:GBP, @decimal_digits=2>=>393.84}>>.

1 tests, 5 assertions, 1 failures, 0 errors, 0 skips


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