A Single Programmer's Blog

I have a passing interest in Git. I haven’t migrated my projects over to it now, but am looking into it. Just for fun, I googled “ruby git”, and I found Ruby/Git. I thought more people should know about this.

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:0×3accb68 @cents=-1200, @currency="USD">> expected but was

4 <#<Money:0×3acca60 @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.