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require File.dirname(__FILE__) + '/../../spec_helper'
require 'bigdecimal'
describe "BigDecimal#+" do
before(:each) do
@one = BigDecimal("1")
@zero = BigDecimal("0")
@two = BigDecimal("2")
@three = BigDecimal("3")
@ten = BigDecimal("10")
@eleven = BigDecimal("11")
@nan = BigDecimal("NaN")
@infinity = BigDecimal("Infinity")
@infinity_minus = BigDecimal("-Infinity")
@one_minus = BigDecimal("-1")
@frac_1 = BigDecimal("1E-99999")
@frac_2 = BigDecimal("0.9E-99999")
end
it "returns a + b" do
(@two + @one).should == @three
(@one + @two).should == @three
(@one + @one_minus).should == @zero
(@zero + @one).should == @one
(@ten + @one).should == @eleven
(@frac_1 + @frac_2).should == BigDecimal("1.9E-99999")
(@frac_2 + @frac_1).should == BigDecimal("1.9E-99999")
(@frac_1 + @frac_1).should == BigDecimal("2E-99999")
# can't do it this way because * isn't implemented yet
# (@frac_1 + @frac_1).should == 2 * @frac_1
end
it "returns NaN if NaN is involved" do
(@one + @nan).nan?.should == true
(@nan + @one).nan?.should == true
end
it "returns Infinity or -Infinity if these are involved" do
(@zero + @infinity).should == @infinity
(@frac_2 + @infinity).should == @infinity
(@two + @infinity_minus).should == @infinity_minus
end
it "returns NaN if Infinity + (- Infinity)" do
(@infinity + @infinity_minus).nan?.should == true
end
it "calls #coerce on the passed argument with self" do
(m = mock('10')).should_receive(:coerce).with(@eleven).and_return([@ten, @eleven])
(@eleven + m).should == @eleven + 10
end
it "calls #method_missing(:coerce) on the passed argument" do
m = mock('10')
m.should_not_receive(:respond_to?).with(:coerce)
m.should_receive(:method_missing).with(:coerce, @eleven).and_return([@ten, @eleven])
(@eleven + m).should == @eleven + 10
end
end
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