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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
58 lines
1.9 KiB
Ruby
58 lines
1.9 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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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).nan?.should == true
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(@nan - @one).nan?.should == true
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(@nan - @nan).nan?.should == true
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(@nan - @infinity).nan?.should == true
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(@nan - @infinity_minus).nan?.should == true
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(@infinity - @nan).nan?.should == true
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(@infinity_minus - @nan).nan?.should == true
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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).nan?.should == true
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(@infinity_minus - @infinity_minus).nan?.should == true
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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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end
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