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1d15d5f080
* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
202 lines
8.5 KiB
Ruby
202 lines
8.5 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require 'bigdecimal'
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describe "BigDecimal#round" do
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before :each do
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@one = BigDecimal("1")
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@two = BigDecimal("2")
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@three = BigDecimal("3")
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@neg_one = BigDecimal("-1")
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@neg_two = BigDecimal("-2")
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@neg_three = BigDecimal("-3")
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@p1_50 = BigDecimal("1.50")
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@p1_51 = BigDecimal("1.51")
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@p1_49 = BigDecimal("1.49")
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@n1_50 = BigDecimal("-1.50")
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@n1_51 = BigDecimal("-1.51")
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@n1_49 = BigDecimal("-1.49")
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@p2_50 = BigDecimal("2.50")
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@p2_51 = BigDecimal("2.51")
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@p2_49 = BigDecimal("2.49")
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@n2_50 = BigDecimal("-2.50")
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@n2_51 = BigDecimal("-2.51")
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@n2_49 = BigDecimal("-2.49")
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end
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after :each do
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BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_UP)
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end
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it "uses default rounding method unless given" do
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@p1_50.round(0).should == @two
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@p1_51.round(0).should == @two
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@p1_49.round(0).should == @one
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@n1_50.round(0).should == @neg_two
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@n1_51.round(0).should == @neg_two
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@n1_49.round(0).should == @neg_one
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@p2_50.round(0).should == @three
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@p2_51.round(0).should == @three
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@p2_49.round(0).should == @two
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@n2_50.round(0).should == @neg_three
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@n2_51.round(0).should == @neg_three
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@n2_49.round(0).should == @neg_two
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BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_DOWN)
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@p1_50.round(0).should == @one
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@p1_51.round(0).should == @one
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@p1_49.round(0).should == @one
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@n1_50.round(0).should == @neg_one
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@n1_51.round(0).should == @neg_one
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@n1_49.round(0).should == @neg_one
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@p2_50.round(0).should == @two
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@p2_51.round(0).should == @two
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@p2_49.round(0).should == @two
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@n2_50.round(0).should == @neg_two
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@n2_51.round(0).should == @neg_two
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@n2_49.round(0).should == @neg_two
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end
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describe "BigDecimal::ROUND_UP" do
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it "rounds values away from zero" do
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@p1_50.round(0, BigDecimal::ROUND_UP).should == @two
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@p1_51.round(0, BigDecimal::ROUND_UP).should == @two
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@p1_49.round(0, BigDecimal::ROUND_UP).should == @two
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@n1_50.round(0, BigDecimal::ROUND_UP).should == @neg_two
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@n1_51.round(0, BigDecimal::ROUND_UP).should == @neg_two
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@n1_49.round(0, BigDecimal::ROUND_UP).should == @neg_two
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@p2_50.round(0, BigDecimal::ROUND_UP).should == @three
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@p2_51.round(0, BigDecimal::ROUND_UP).should == @three
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@p2_49.round(0, BigDecimal::ROUND_UP).should == @three
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@n2_50.round(0, BigDecimal::ROUND_UP).should == @neg_three
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@n2_51.round(0, BigDecimal::ROUND_UP).should == @neg_three
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@n2_49.round(0, BigDecimal::ROUND_UP).should == @neg_three
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end
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end
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describe "BigDecimal::ROUND_DOWN" do
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it "rounds values towards zero" do
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@p1_50.round(0, BigDecimal::ROUND_DOWN).should == @one
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@p1_51.round(0, BigDecimal::ROUND_DOWN).should == @one
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@p1_49.round(0, BigDecimal::ROUND_DOWN).should == @one
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@n1_50.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
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@n1_51.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
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@n1_49.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
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@p2_50.round(0, BigDecimal::ROUND_DOWN).should == @two
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@p2_51.round(0, BigDecimal::ROUND_DOWN).should == @two
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@p2_49.round(0, BigDecimal::ROUND_DOWN).should == @two
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@n2_50.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
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@n2_51.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
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@n2_49.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
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end
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end
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describe "BigDecimal::ROUND_HALF_UP" do
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it "rounds values >= 5 up, otherwise down" do
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@p1_50.round(0, BigDecimal::ROUND_HALF_UP).should == @two
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@p1_51.round(0, BigDecimal::ROUND_HALF_UP).should == @two
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@p1_49.round(0, BigDecimal::ROUND_HALF_UP).should == @one
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@n1_50.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
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@n1_51.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
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@n1_49.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_one
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@p2_50.round(0, BigDecimal::ROUND_HALF_UP).should == @three
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@p2_51.round(0, BigDecimal::ROUND_HALF_UP).should == @three
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@p2_49.round(0, BigDecimal::ROUND_HALF_UP).should == @two
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@n2_50.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_three
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@n2_51.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_three
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@n2_49.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
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end
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end
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describe "BigDecimal::ROUND_HALF_DOWN" do
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it "rounds values > 5 up, otherwise down" do
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@p1_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @one
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@p1_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
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@p1_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @one
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@n1_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_one
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@n1_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
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@n1_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_one
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@p2_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
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@p2_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @three
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@p2_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
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@n2_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
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@n2_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_three
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@n2_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
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end
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end
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describe "BigDecimal::ROUND_CEILING" do
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it "rounds values towards +infinity" do
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@p1_50.round(0, BigDecimal::ROUND_CEILING).should == @two
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@p1_51.round(0, BigDecimal::ROUND_CEILING).should == @two
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@p1_49.round(0, BigDecimal::ROUND_CEILING).should == @two
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@n1_50.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
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@n1_51.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
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@n1_49.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
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@p2_50.round(0, BigDecimal::ROUND_CEILING).should == @three
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@p2_51.round(0, BigDecimal::ROUND_CEILING).should == @three
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@p2_49.round(0, BigDecimal::ROUND_CEILING).should == @three
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@n2_50.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
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@n2_51.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
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@n2_49.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
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end
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end
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describe "BigDecimal::ROUND_FLOOR" do
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it "rounds values towards -infinity" do
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@p1_50.round(0, BigDecimal::ROUND_FLOOR).should == @one
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@p1_51.round(0, BigDecimal::ROUND_FLOOR).should == @one
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@p1_49.round(0, BigDecimal::ROUND_FLOOR).should == @one
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@n1_50.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
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@n1_51.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
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@n1_49.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
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@p2_50.round(0, BigDecimal::ROUND_FLOOR).should == @two
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@p2_51.round(0, BigDecimal::ROUND_FLOOR).should == @two
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@p2_49.round(0, BigDecimal::ROUND_FLOOR).should == @two
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@n2_50.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
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@n2_51.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
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@n2_49.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
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end
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end
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describe "BigDecimal::ROUND_HALF_EVEN" do
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it "rounds values > 5 up, < 5 down and == 5 towards even neighbor" do
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@p1_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
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@p1_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
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@p1_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @one
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@n1_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
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@n1_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
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@n1_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_one
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@p2_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
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@p2_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @three
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@p2_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
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@n2_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
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@n2_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_three
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@n2_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
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end
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end
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it 'raise exception, if self is special value' do
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lambda { BigDecimal('NaN').round }.should raise_error(FloatDomainError)
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lambda { BigDecimal('Infinity').round }.should raise_error(FloatDomainError)
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lambda { BigDecimal('-Infinity').round }.should raise_error(FloatDomainError)
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end
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it 'do not raise exception, if self is special value and precision is given' do
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lambda { BigDecimal('NaN').round(2) }.should_not raise_error(FloatDomainError)
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lambda { BigDecimal('Infinity').round(2) }.should_not raise_error(FloatDomainError)
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lambda { BigDecimal('-Infinity').round(2) }.should_not raise_error(FloatDomainError)
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end
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end
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