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If you are creating specs comparing BigDecimals to a hard coded float value, you may find that some comparisons just dont work even when the numbers are supposedly the same (see Floating point accuracy problems)

<br /> # total amount is a BigDecimal<br /> invoice.total_amount.to_f.should == 100.15</p> <p>‘total invoiced amount should be 100.15′ FAILED<br /> expected: 10.15,<br /> got: 10.15 (using ==)</p> <p>

What we are testing is the value and the type, the correct way of achieving this may be…

<br /> invoice.total_amount.should == BigDecimal.new(’100.15′)<br />

If you want to round the big decimal to a float with 2 decimal places you could also use

<br /> class BigDecimal<br /> def to_money<br /> (self * 100).round.to_f / 100.0<br /> end<br /> end<br />

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