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54 lines
1.5 KiB
Ruby
54 lines
1.5 KiB
Ruby
require_relative '../../spec_helper'
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require 'bigdecimal'
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describe "BigDecimal#+" do
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before :each do
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@one = BigDecimal("1")
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@zero = BigDecimal("0")
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@two = BigDecimal("2")
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@three = BigDecimal("3")
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@ten = BigDecimal("10")
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@eleven = BigDecimal("11")
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@nan = BigDecimal("NaN")
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@infinity = BigDecimal("Infinity")
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@infinity_minus = BigDecimal("-Infinity")
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@one_minus = BigDecimal("-1")
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@frac_1 = BigDecimal("1E-99999")
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@frac_2 = BigDecimal("0.9E-99999")
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end
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it "returns a + b" do
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(@two + @one).should == @three
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(@one + @two).should == @three
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(@one + @one_minus).should == @zero
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(@zero + @one).should == @one
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(@ten + @one).should == @eleven
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(@frac_1 + @frac_2).should == BigDecimal("1.9E-99999")
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(@frac_2 + @frac_1).should == BigDecimal("1.9E-99999")
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(@frac_1 + @frac_1).should == BigDecimal("2E-99999")
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end
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it "returns NaN if NaN is involved" do
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(@one + @nan).should.nan?
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(@nan + @one).should.nan?
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end
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it "returns Infinity or -Infinity if these are involved" do
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(@zero + @infinity).should == @infinity
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(@frac_2 + @infinity).should == @infinity
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(@two + @infinity_minus).should == @infinity_minus
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end
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it "returns NaN if Infinity + (- Infinity)" do
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(@infinity + @infinity_minus).should.nan?
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end
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describe "with Object" do
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it "tries to coerce the other operand to self" do
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object = mock("Object")
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object.should_receive(:coerce).with(@one).and_return([@one, BigDecimal("42")])
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(@one + object).should == BigDecimal("43")
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end
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end
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end
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