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-rw-r--r--spec/ruby/shared/rational/round.rb106
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diff --git a/spec/ruby/shared/rational/round.rb b/spec/ruby/shared/rational/round.rb
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-require_relative '../../spec_helper'
-
-describe :rational_round, shared: true do
- before do
- @rational = Rational(2200, 7)
- end
-
- describe "with no arguments (precision = 0)" do
- it "returns an integer" do
- @rational.round.should be_kind_of(Integer)
- Rational(0, 1).round(0).should be_kind_of(Integer)
- Rational(124, 1).round(0).should be_kind_of(Integer)
- end
-
- it "returns the truncated value toward the nearest integer" do
- @rational.round.should == 314
- Rational(0, 1).round(0).should == 0
- Rational(2, 1).round(0).should == 2
- end
-
- it "returns the rounded value toward the nearest integer" do
- Rational(1, 2).round.should == 1
- Rational(-1, 2).round.should == -1
- Rational(3, 2).round.should == 2
- Rational(-3, 2).round.should == -2
- Rational(5, 2).round.should == 3
- Rational(-5, 2).round.should == -3
- end
- end
-
- describe "with a precision < 0" do
- it "returns an integer" do
- @rational.round(-2).should be_kind_of(Integer)
- @rational.round(-1).should be_kind_of(Integer)
- Rational(0, 1).round(-1).should be_kind_of(Integer)
- Rational(2, 1).round(-1).should be_kind_of(Integer)
- end
-
- it "moves the truncation point n decimal places left" do
- @rational.round(-3).should == 0
- @rational.round(-2).should == 300
- @rational.round(-1).should == 310
- end
- end
-
- describe "with a precision > 0" do
- it "returns a Rational" do
- @rational.round(1).should be_kind_of(Rational)
- @rational.round(2).should be_kind_of(Rational)
- # Guard against the Mathn library
- guard -> { !defined?(Math.rsqrt) } do
- Rational(0, 1).round(1).should be_kind_of(Rational)
- Rational(2, 1).round(1).should be_kind_of(Rational)
- end
- end
-
- it "moves the truncation point n decimal places right" do
- @rational.round(1).should == Rational(3143, 10)
- @rational.round(2).should == Rational(31429, 100)
- @rational.round(3).should == Rational(157143, 500)
- Rational(0, 1).round(1).should == Rational(0, 1)
- Rational(2, 1).round(1).should == Rational(2, 1)
- end
-
- it "doesn't alter the value if the precision is too great" do
- Rational(3, 2).round(10).should == Rational(3, 2).round(20)
- end
-
- # #6605
- it "doesn't fail when rounding to an absurdly large positive precision" do
- Rational(3, 2).round(2_097_171).should == Rational(3, 2)
- end
- end
-
- describe "with half option" do
- it "returns an Integer when precision is not passed" do
- Rational(10, 4).round(half: nil).should == 3
- Rational(10, 4).round(half: :up).should == 3
- Rational(10, 4).round(half: :down).should == 2
- Rational(10, 4).round(half: :even).should == 2
- Rational(-10, 4).round(half: nil).should == -3
- Rational(-10, 4).round(half: :up).should == -3
- Rational(-10, 4).round(half: :down).should == -2
- Rational(-10, 4).round(half: :even).should == -2
- end
-
- it "returns a Rational when the precision is greater than 0" do
- Rational(25, 100).round(1, half: nil).should == Rational(3, 10)
- Rational(25, 100).round(1, half: :up).should == Rational(3, 10)
- Rational(25, 100).round(1, half: :down).should == Rational(1, 5)
- Rational(25, 100).round(1, half: :even).should == Rational(1, 5)
- Rational(35, 100).round(1, half: nil).should == Rational(2, 5)
- Rational(35, 100).round(1, half: :up).should == Rational(2, 5)
- Rational(35, 100).round(1, half: :down).should == Rational(3, 10)
- Rational(35, 100).round(1, half: :even).should == Rational(2, 5)
- Rational(-25, 100).round(1, half: nil).should == Rational(-3, 10)
- Rational(-25, 100).round(1, half: :up).should == Rational(-3, 10)
- Rational(-25, 100).round(1, half: :down).should == Rational(-1, 5)
- Rational(-25, 100).round(1, half: :even).should == Rational(-1, 5)
- end
-
- it "raise for a non-existent round mode" do
- -> { Rational(10, 4).round(half: :nonsense) }.should raise_error(ArgumentError, "invalid rounding mode: nonsense")
- end
- end
-end