Hongli Lai took the lead/moved Money to GitHub. And the bug didn’t exist a couple of days after I wrote this entry originally.

The Money library is a useful. Unfortunately, release 1.5.9 has an error. One cannot substract an amount from the empty Money.

1 def test_substract_from_zero
2   assert_equal -12.to_money, Money.empty - (12.to_money)
3 end

The test case will fail with this:

1   1) Failure:
2 test_substract_from_zero(MoneyTest) [./test/unit/money_test.rb:29]:
3 <#<Money:0x3accb68 @cents=-1200, @currency="USD">> expected but was
4 <#<Money:0x3acca60 @cents=1200, @currency="USD">>.

The error is caused by Money#-(other_money):

1 def -(other_money)
2   return other_money.dup if cents.zero?
3   ...
4 end

return other_money.dup if cents.zero? should be removed to allow the test case to pass.

Update (2006-02-13): Tobias already posted a new version of the library, available as a gem.

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I am François Beausoleil, a Ruby on Rails and Scala developer. During the day, I work on Seevibes, a platform to measure social interactions related to TV shows. At night, I am interested many things. Read my biography.

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