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require File.dirname(__FILE__) + '/../../spec_helper'
require 'rational'
describe "Rational#** when passed [Rational]" do
conflicts_with :Prime do
it "converts self to a Float and returns it raised to the passed argument" do
(Rational(3, 4) ** Rational(4, 3)).should be_close(0.681420222312052, TOLERANCE)
(Rational(3, 4) ** Rational(-4, 3)).should be_close(1.46752322173095, TOLERANCE)
(Rational(3, 4) ** Rational(4, -3)).should be_close(1.46752322173095, TOLERANCE)
(Rational(3, 4) ** Rational(0, 3)).should eql(1.0)
(Rational(-3, 4) ** Rational(0, 3)).should eql(1.0)
(Rational(3, -4) ** Rational(0, 3)).should eql(1.0)
(Rational(3, 4) ** Rational(0, -3)).should eql(1.0)
(Rational(bignum_value, 4) ** Rational(0, 3)).should eql(1.0)
(Rational(3, -bignum_value) ** Rational(0, 3)).should eql(1.0)
(Rational(3, 4) ** Rational(0, bignum_value)).should eql(1.0)
(Rational(3, 4) ** Rational(0, -bignum_value)).should eql(1.0)
end
it "returns NaN when self is negative and the passed argument is not 0" do
(Rational(-3, 4) ** Rational(-4, 3)).nan?.should be_true
end
end
end
describe "Rational#** when passed [Integer]" do
it "returns the Rational value of self raised to the passed argument" do
(Rational(3, 4) ** 4).should == Rational(81, 256)
(Rational(3, 4) ** -4).should == Rational(256, 81)
(Rational(-3, 4) ** -4).should == Rational(256, 81)
(Rational(3, -4) ** -4).should == Rational(256, 81)
(Rational(bignum_value, 4) ** 4).should == Rational(28269553036454149273332760011886696253239742350009903329945699220681916416, 1)
(Rational(3, bignum_value) ** -4).should == Rational(7237005577332262213973186563042994240829374041602535252466099000494570602496, 81)
(Rational(-bignum_value, 4) ** -4).should == Rational(1, 28269553036454149273332760011886696253239742350009903329945699220681916416)
(Rational(3, -bignum_value) ** -4).should == Rational(7237005577332262213973186563042994240829374041602535252466099000494570602496, 81)
end
conflicts_with :Prime do
it "returns Rational(1, 1) when the passed argument is 0" do
(Rational(3, 4) ** 0).should eql(Rational(1, 1))
(Rational(-3, 4) ** 0).should eql(Rational(1, 1))
(Rational(3, -4) ** 0).should eql(Rational(1, 1))
(Rational(bignum_value, 4) ** 0).should eql(Rational(1, 1))
(Rational(3, -bignum_value) ** 0).should eql(Rational(1, 1))
end
end
end
describe "Rational#** when passed [Float]" do
it "returns self converted to Float and raised to the passed argument" do
(Rational(3, 1) ** 3.0).should eql(27.0)
(Rational(3, 1) ** 1.5).should be_close(5.19615242270663, TOLERANCE)
(Rational(3, 1) ** -1.5).should be_close(0.192450089729875, TOLERANCE)
end
it "returns 1.0 when the passed argument is 0" do
(Rational(3, 4) ** 0.0).should eql(1.0)
(Rational(-3, 4) ** 0.0).should eql(1.0)
(Rational(-3, 4) ** 0.0).should eql(1.0)
end
it "returns NaN if self is negative and the passed argument is not 0" do
(Rational(-3, 2) ** 1.5).nan?.should be_true
(Rational(3, -2) ** 1.5).nan?.should be_true
(Rational(3, -2) ** -1.5).nan?.should be_true
end
end
describe "Rational#**" do
it "calls #coerce on the passed argument with self" do
rational = Rational(3, 4)
obj = mock("Object")
obj.should_receive(:coerce).with(rational).and_return([1, 2])
rational ** obj
end
it "calls #** on the coerced Rational with the coerced Object" do
rational = Rational(3, 4)
coerced_rational = mock("Coerced Rational")
coerced_rational.should_receive(:**).and_return(:result)
coerced_obj = mock("Coerced Object")
obj = mock("Object")
obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj])
(rational ** obj).should == :result
end
end
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