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require File.dirname(__FILE__) + '/../../spec_helper'
require 'rational'
describe "Rational#/ when passed [Rational]" do
it "returns self divided by other as a Rational" do
(Rational(3, 4) / Rational(3, 4)).should eql(Rational(1, 1))
(Rational(2, 4) / Rational(1, 4)).should eql(Rational(2, 1))
(Rational(2, 4) / 2).should == Rational(1, 4)
(Rational(6, 7) / -2).should == Rational(-3, 7)
end
it "raises a ZeroDivisionError when passed a Rational with a numerator of 0" do
lambda { Rational(3, 4) / Rational(0, 1) }.should raise_error(ZeroDivisionError)
end
end
describe "Rational#/ when passed [Integer]" do
it "returns self divided by other as a Rational" do
(Rational(3, 4) / 2).should eql(Rational(3, 8))
(Rational(2, 4) / 2).should eql(Rational(1, 4))
(Rational(6, 7) / -2).should eql(Rational(-3, 7))
end
it "raises a ZeroDivisionError when passed 0" do
lambda { Rational(3, 4) / 0 }.should raise_error(ZeroDivisionError)
end
end
describe "Raional#/ when passed [Float]" do
it "returns self divided by other as a Float" do
(Rational(3, 4) / 0.75).should eql(1.0)
(Rational(3, 4) / 0.25).should eql(3.0)
(Rational(3, 4) / 0.3).should eql(2.5)
(Rational(-3, 4) / 0.3).should eql(-2.5)
(Rational(3, -4) / 0.3).should eql(-2.5)
(Rational(3, 4) / -0.3).should eql(-2.5)
end
it "returns infinity when passed 0" do
(Rational(3, 4) / 0.0).infinite?.should eql(1)
(Rational(-3, -4) / 0.0).infinite?.should eql(1)
(Rational(-3, 4) / 0.0).infinite?.should eql(-1)
(Rational(3, -4) / 0.0).infinite?.should eql(-1)
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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