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66 lines
2 KiB
Ruby
66 lines
2 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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@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 == @one
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(@one - @two).should == @one_minus
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(@one - @one_minus).should == @two
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(@frac_2 - @frac_1).should == BigDecimal("-0.1E-99999")
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(@two - @two).should == @zero
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(@frac_1 - @frac_1).should == @zero
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(BigDecimal('1.23456789') - BigDecimal('1.2')).should == BigDecimal("0.03456789")
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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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(@nan - @nan).should.nan?
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(@nan - @infinity).should.nan?
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(@nan - @infinity_minus).should.nan?
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(@infinity - @nan).should.nan?
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(@infinity_minus - @nan).should.nan?
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end
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it "returns NaN both operands are infinite with the same sign" do
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(@infinity - @infinity).should.nan?
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(@infinity_minus - @infinity_minus).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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(@infinity - @infinity_minus).should == @infinity
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(@infinity_minus - @infinity).should == @infinity_minus
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(@infinity - @zero).should == @infinity
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(@infinity - @frac_2).should == @infinity
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(@infinity - @two).should == @infinity
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(@infinity - @one_minus).should == @infinity
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(@zero - @infinity).should == @infinity_minus
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(@frac_2 - @infinity).should == @infinity_minus
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(@two - @infinity).should == @infinity_minus
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(@one_minus - @infinity).should == @infinity_minus
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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("-41")
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end
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end
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end
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