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require File.expand_path('../../../spec_helper', __FILE__)
require 'bigdecimal'
describe "BigDecimal#round" do
before :each do
@one = BigDecimal("1")
@two = BigDecimal("2")
@three = BigDecimal("3")
@neg_one = BigDecimal("-1")
@neg_two = BigDecimal("-2")
@neg_three = BigDecimal("-3")
@p1_50 = BigDecimal("1.50")
@p1_51 = BigDecimal("1.51")
@p1_49 = BigDecimal("1.49")
@n1_50 = BigDecimal("-1.50")
@n1_51 = BigDecimal("-1.51")
@n1_49 = BigDecimal("-1.49")
@p2_50 = BigDecimal("2.50")
@p2_51 = BigDecimal("2.51")
@p2_49 = BigDecimal("2.49")
@n2_50 = BigDecimal("-2.50")
@n2_51 = BigDecimal("-2.51")
@n2_49 = BigDecimal("-2.49")
end
after :each do
BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_HALF_UP)
end
it "uses default rounding method unless given" do
@p1_50.round(0).should == @two
@p1_51.round(0).should == @two
@p1_49.round(0).should == @one
@n1_50.round(0).should == @neg_two
@n1_51.round(0).should == @neg_two
@n1_49.round(0).should == @neg_one
@p2_50.round(0).should == @three
@p2_51.round(0).should == @three
@p2_49.round(0).should == @two
@n2_50.round(0).should == @neg_three
@n2_51.round(0).should == @neg_three
@n2_49.round(0).should == @neg_two
BigDecimal.mode(BigDecimal::ROUND_MODE, BigDecimal::ROUND_DOWN)
@p1_50.round(0).should == @one
@p1_51.round(0).should == @one
@p1_49.round(0).should == @one
@n1_50.round(0).should == @neg_one
@n1_51.round(0).should == @neg_one
@n1_49.round(0).should == @neg_one
@p2_50.round(0).should == @two
@p2_51.round(0).should == @two
@p2_49.round(0).should == @two
@n2_50.round(0).should == @neg_two
@n2_51.round(0).should == @neg_two
@n2_49.round(0).should == @neg_two
end
describe "BigDecimal::ROUND_UP" do
it "rounds values away from zero" do
@p1_50.round(0, BigDecimal::ROUND_UP).should == @two
@p1_51.round(0, BigDecimal::ROUND_UP).should == @two
@p1_49.round(0, BigDecimal::ROUND_UP).should == @two
@n1_50.round(0, BigDecimal::ROUND_UP).should == @neg_two
@n1_51.round(0, BigDecimal::ROUND_UP).should == @neg_two
@n1_49.round(0, BigDecimal::ROUND_UP).should == @neg_two
@p2_50.round(0, BigDecimal::ROUND_UP).should == @three
@p2_51.round(0, BigDecimal::ROUND_UP).should == @three
@p2_49.round(0, BigDecimal::ROUND_UP).should == @three
@n2_50.round(0, BigDecimal::ROUND_UP).should == @neg_three
@n2_51.round(0, BigDecimal::ROUND_UP).should == @neg_three
@n2_49.round(0, BigDecimal::ROUND_UP).should == @neg_three
end
end
describe "BigDecimal::ROUND_DOWN" do
it "rounds values towards zero" do
@p1_50.round(0, BigDecimal::ROUND_DOWN).should == @one
@p1_51.round(0, BigDecimal::ROUND_DOWN).should == @one
@p1_49.round(0, BigDecimal::ROUND_DOWN).should == @one
@n1_50.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
@n1_51.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
@n1_49.round(0, BigDecimal::ROUND_DOWN).should == @neg_one
@p2_50.round(0, BigDecimal::ROUND_DOWN).should == @two
@p2_51.round(0, BigDecimal::ROUND_DOWN).should == @two
@p2_49.round(0, BigDecimal::ROUND_DOWN).should == @two
@n2_50.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
@n2_51.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
@n2_49.round(0, BigDecimal::ROUND_DOWN).should == @neg_two
end
end
describe "BigDecimal::ROUND_HALF_UP" do
it "rounds values >= 5 up, otherwise down" do
@p1_50.round(0, BigDecimal::ROUND_HALF_UP).should == @two
@p1_51.round(0, BigDecimal::ROUND_HALF_UP).should == @two
@p1_49.round(0, BigDecimal::ROUND_HALF_UP).should == @one
@n1_50.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
@n1_51.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
@n1_49.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_one
@p2_50.round(0, BigDecimal::ROUND_HALF_UP).should == @three
@p2_51.round(0, BigDecimal::ROUND_HALF_UP).should == @three
@p2_49.round(0, BigDecimal::ROUND_HALF_UP).should == @two
@n2_50.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_three
@n2_51.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_three
@n2_49.round(0, BigDecimal::ROUND_HALF_UP).should == @neg_two
end
end
describe "BigDecimal::ROUND_HALF_DOWN" do
it "rounds values > 5 up, otherwise down" do
@p1_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @one
@p1_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
@p1_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @one
@n1_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_one
@n1_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
@n1_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_one
@p2_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
@p2_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @three
@p2_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @two
@n2_50.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
@n2_51.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_three
@n2_49.round(0, BigDecimal::ROUND_HALF_DOWN).should == @neg_two
end
end
describe "BigDecimal::ROUND_CEILING" do
it "rounds values towards +infinity" do
@p1_50.round(0, BigDecimal::ROUND_CEILING).should == @two
@p1_51.round(0, BigDecimal::ROUND_CEILING).should == @two
@p1_49.round(0, BigDecimal::ROUND_CEILING).should == @two
@n1_50.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
@n1_51.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
@n1_49.round(0, BigDecimal::ROUND_CEILING).should == @neg_one
@p2_50.round(0, BigDecimal::ROUND_CEILING).should == @three
@p2_51.round(0, BigDecimal::ROUND_CEILING).should == @three
@p2_49.round(0, BigDecimal::ROUND_CEILING).should == @three
@n2_50.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
@n2_51.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
@n2_49.round(0, BigDecimal::ROUND_CEILING).should == @neg_two
end
end
describe "BigDecimal::ROUND_FLOOR" do
it "rounds values towards -infinity" do
@p1_50.round(0, BigDecimal::ROUND_FLOOR).should == @one
@p1_51.round(0, BigDecimal::ROUND_FLOOR).should == @one
@p1_49.round(0, BigDecimal::ROUND_FLOOR).should == @one
@n1_50.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
@n1_51.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
@n1_49.round(0, BigDecimal::ROUND_FLOOR).should == @neg_two
@p2_50.round(0, BigDecimal::ROUND_FLOOR).should == @two
@p2_51.round(0, BigDecimal::ROUND_FLOOR).should == @two
@p2_49.round(0, BigDecimal::ROUND_FLOOR).should == @two
@n2_50.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
@n2_51.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
@n2_49.round(0, BigDecimal::ROUND_FLOOR).should == @neg_three
end
end
describe "BigDecimal::ROUND_HALF_EVEN" do
it "rounds values > 5 up, < 5 down and == 5 towards even neighbor" do
@p1_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
@p1_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
@p1_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @one
@n1_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
@n1_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
@n1_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_one
@p2_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
@p2_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @three
@p2_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @two
@n2_50.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
@n2_51.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_three
@n2_49.round(0, BigDecimal::ROUND_HALF_EVEN).should == @neg_two
end
end
it 'raise exception, if self is special value' do
lambda { BigDecimal('NaN').round }.should raise_error(FloatDomainError)
lambda { BigDecimal('Infinity').round }.should raise_error(FloatDomainError)
lambda { BigDecimal('-Infinity').round }.should raise_error(FloatDomainError)
end
it 'do not raise exception, if self is special value and precision is given' do
lambda { BigDecimal('NaN').round(2) }.should_not raise_error(FloatDomainError)
lambda { BigDecimal('Infinity').round(2) }.should_not raise_error(FloatDomainError)
lambda { BigDecimal('-Infinity').round(2) }.should_not raise_error(FloatDomainError)
end
end
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