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