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 ruby_version_is "2.4" do describe "with half option" do it "returns an Integer when precision is not passed" do 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: :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: :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: :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: :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 end end end