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require_relative "../../spec_helper"
require_relative 'shared/arithmetic_exception_in_coerce'
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
it_behaves_like :rational_arithmetic_exception_in_coerce, :*
end
describe "Rational#* passed a Rational" do
it "returns self divided by other as a Rational" do
(Rational(3, 4) * Rational(3, 4)).should eql(Rational(9, 16))
(Rational(2, 4) * Rational(1, 4)).should eql(Rational(1, 8))
(Rational(3, 4) * Rational(0, 1)).should eql(Rational(0, 4))
end
end
describe "Rational#* passed a Float" do
it "returns self divided by other as a Float" do
(Rational(3, 4) * 0.75).should eql(0.5625)
(Rational(3, 4) * 0.25).should eql(0.1875)
(Rational(3, 4) * 0.3).should be_close(0.225, TOLERANCE)
(Rational(-3, 4) * 0.3).should be_close(-0.225, TOLERANCE)
(Rational(3, -4) * 0.3).should be_close(-0.225, TOLERANCE)
(Rational(3, 4) * -0.3).should be_close(-0.225, TOLERANCE)
(Rational(3, 4) * 0.0).should eql(0.0)
(Rational(-3, -4) * 0.0).should eql(0.0)
(Rational(-3, 4) * 0.0).should eql(0.0)
(Rational(3, -4) * 0.0).should eql(0.0)
end
end
describe "Rational#* passed an Integer" do
it "returns self divided by other as a Rational" do
(Rational(3, 4) * 2).should eql(Rational(3, 2))
(Rational(2, 4) * 2).should eql(Rational(1, 1))
(Rational(6, 7) * -2).should eql(Rational(-12, 7))
(Rational(3, 4) * 0).should eql(Rational(0, 4))
end
end
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