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require_relative '../../spec_helper'
require_relative '../../shared/rational/arithmetic_exception_in_coerce'
describe "Rational#-" do
it_behaves_like :rational_arithmetic_exception_in_coerce, :-
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
describe "Rational#- passed a Rational" do
it "returns the result of subtracting other from self as a Rational" do
(Rational(3, 4) - Rational(0, 1)).should eql(Rational(3, 4))
(Rational(3, 4) - Rational(1, 4)).should eql(Rational(1, 2))
(Rational(3, 4) - Rational(2, 1)).should eql(Rational(-5, 4))
end
end
describe "Rational#- passed a Float" do
it "returns the result of subtracting other from self as a Float" do
(Rational(3, 4) - 0.2).should eql(0.55)
(Rational(3, 4) - 2.5).should eql(-1.75)
end
end
describe "Rational#- passed an Integer" do
it "returns the result of subtracting other from self as a Rational" do
(Rational(3, 4) - 1).should eql(Rational(-1, 4))
(Rational(3, 4) - 2).should eql(Rational(-5, 4))
end
end
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