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51 lines
1.5 KiB
Ruby
51 lines
1.5 KiB
Ruby
require_relative '../../spec_helper'
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require_relative '../../shared/rational/arithmetic_exception_in_coerce'
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describe "Rational#-" do
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it_behaves_like :rational_arithmetic_exception_in_coerce, :-
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it "calls #coerce on the passed argument with self" do
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rational = Rational(3, 4)
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obj = mock("Object")
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obj.should_receive(:coerce).with(rational).and_return([1, 2])
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rational - obj
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end
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it "calls #- on the coerced Rational with the coerced Object" do
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rational = Rational(3, 4)
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coerced_rational = mock("Coerced Rational")
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coerced_rational.should_receive(:-).and_return(:result)
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coerced_obj = mock("Coerced Object")
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obj = mock("Object")
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obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj])
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(rational - obj).should == :result
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end
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end
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describe "Rational#- passed a Rational" do
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it "returns the result of subtracting other from self as a Rational" do
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(Rational(3, 4) - Rational(0, 1)).should eql(Rational(3, 4))
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(Rational(3, 4) - Rational(1, 4)).should eql(Rational(1, 2))
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(Rational(3, 4) - Rational(2, 1)).should eql(Rational(-5, 4))
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end
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end
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describe "Rational#- passed a Float" do
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it "returns the result of subtracting other from self as a Float" do
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(Rational(3, 4) - 0.2).should eql(0.55)
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(Rational(3, 4) - 2.5).should eql(-1.75)
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end
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end
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describe "Rational#- passed an Integer" do
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it "returns the result of subtracting other from self as a Rational" do
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(Rational(3, 4) - 1).should eql(Rational(-1, 4))
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(Rational(3, 4) - 2).should eql(Rational(-5, 4))
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end
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end
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