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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
101 lines
3.6 KiB
Ruby
101 lines
3.6 KiB
Ruby
require_relative '../../spec_helper'
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describe "Float#round" do
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it "returns the nearest Integer" do
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5.5.round.should == 6
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0.4.round.should == 0
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0.6.round.should == 1
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-1.4.round.should == -1
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-2.8.round.should == -3
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0.0.round.should == 0
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end
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platform_is_not :mingw32 do
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it "returns the nearest Integer for Float near the limit" do
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0.49999999999999994.round.should == 0
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-0.49999999999999994.round.should == 0
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end
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end
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it "raises FloatDomainError for exceptional values" do
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lambda { (+infinity_value).round }.should raise_error(FloatDomainError)
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lambda { (-infinity_value).round }.should raise_error(FloatDomainError)
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lambda { nan_value.round }.should raise_error(FloatDomainError)
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end
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it "rounds self to an optionally given precision" do
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5.5.round(0).should eql(6)
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5.7.round(1).should eql(5.7)
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1.2345678.round(2).should == 1.23
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123456.78.round(-2).should eql(123500) # rounded up
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-123456.78.round(-2).should eql(-123500)
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12.345678.round(3.999).should == 12.346
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end
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it "returns zero when passed a negative argument with magitude greater the magitude of the whole number portion of the Float" do
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0.8346268.round(-1).should eql(0)
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end
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it "raises a TypeError when its argument can not be converted to an Integer" do
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lambda { 1.0.round("4") }.should raise_error(TypeError)
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lambda { 1.0.round(nil) }.should raise_error(TypeError)
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end
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it "raises FloatDomainError for exceptional values when passed a non-positive precision" do
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lambda { Float::INFINITY.round( 0) }.should raise_error(FloatDomainError)
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lambda { Float::INFINITY.round(-2) }.should raise_error(FloatDomainError)
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lambda { (-Float::INFINITY).round( 0) }.should raise_error(FloatDomainError)
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lambda { (-Float::INFINITY).round(-2) }.should raise_error(FloatDomainError)
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end
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it "raises RangeError for NAN when passed a non-positive precision" do
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lambda { Float::NAN.round(0) }.should raise_error(RangeError)
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lambda { Float::NAN.round(-2) }.should raise_error(RangeError)
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end
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it "returns self for exceptional values when passed a non-negative precision" do
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Float::INFINITY.round(2).should == Float::INFINITY
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(-Float::INFINITY).round(2).should == -Float::INFINITY
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Float::NAN.round(2).should be_nan
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end
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# redmine:5227
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it "works for corner cases" do
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42.0.round(308).should eql(42.0)
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1.0e307.round(2).should eql(1.0e307)
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end
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# redmine:5271
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it "returns rounded values for big argument" do
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0.42.round(2.0**30).should == 0.42
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end
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it "returns big values rounded to nearest" do
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+2.5e20.round(-20).should eql( +3 * 10 ** 20 )
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-2.5e20.round(-20).should eql( -3 * 10 ** 20 )
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end
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# redmine #5272
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it "returns rounded values for big values" do
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+2.4e20.round(-20).should eql( +2 * 10 ** 20 )
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-2.4e20.round(-20).should eql( -2 * 10 ** 20 )
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+2.5e200.round(-200).should eql( +3 * 10 ** 200 )
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+2.4e200.round(-200).should eql( +2 * 10 ** 200 )
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-2.5e200.round(-200).should eql( -3 * 10 ** 200 )
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-2.4e200.round(-200).should eql( -2 * 10 ** 200 )
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end
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ruby_version_is "2.4" do
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it "returns different rounded values depending on the half option" do
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2.5.round(half: :up).should eql(3)
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2.5.round(half: :down).should eql(2)
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2.5.round(half: :even).should eql(2)
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3.5.round(half: :up).should eql(4)
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3.5.round(half: :down).should eql(3)
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3.5.round(half: :even).should eql(4)
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(-2.5).round(half: :up).should eql(-3)
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(-2.5).round(half: :down).should eql(-2)
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(-2.5).round(half: :even).should eql(-2)
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end
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end
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end
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