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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
103 lines
3 KiB
Ruby
103 lines
3 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../../../fixtures/rational', __FILE__)
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describe :kernel_Rational, shared: true do
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describe "passed Integer" do
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# Guard against the Mathn library
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conflicts_with :Prime do
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it "returns a new Rational number with 1 as the denominator" do
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Rational(1).should eql(Rational(1, 1))
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Rational(-3).should eql(Rational(-3, 1))
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Rational(bignum_value).should eql(Rational(bignum_value, 1))
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end
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end
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end
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describe "passed two integers" do
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it "returns a new Rational number" do
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rat = Rational(1, 2)
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rat.numerator.should == 1
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rat.denominator.should == 2
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rat.should be_an_instance_of(Rational)
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rat = Rational(-3, -5)
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rat.numerator.should == 3
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rat.denominator.should == 5
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rat.should be_an_instance_of(Rational)
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rat = Rational(bignum_value, 3)
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rat.numerator.should == bignum_value
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rat.denominator.should == 3
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rat.should be_an_instance_of(Rational)
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end
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it "reduces the Rational" do
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rat = Rational(2, 4)
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rat.numerator.should == 1
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rat.denominator.should == 2
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rat = Rational(3, 9)
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rat.numerator.should == 1
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rat.denominator.should == 3
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end
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end
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describe "when passed a String" do
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it "converts the String to a Rational using the same method as String#to_r" do
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r = Rational(13, 25)
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s_r = ".52".to_r
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r_s = Rational(".52")
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r_s.should == r
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r_s.should == s_r
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end
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it "scales the Rational value of the first argument by the Rational value of the second" do
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Rational(".52", ".6").should == Rational(13, 15)
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Rational(".52", "1.6").should == Rational(13, 40)
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end
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it "does not use the same method as Float#to_r" do
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r = Rational(3, 5)
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f_r = 0.6.to_r
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r_s = Rational("0.6")
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r_s.should == r
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r_s.should_not == f_r
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end
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describe "when passed a Numeric" do
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it "calls #to_r to convert the first argument to a Rational" do
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num = RationalSpecs::SubNumeric.new(2)
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Rational(num).should == Rational(2)
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end
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end
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describe "when passed a Complex" do
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it "returns a Rational from the real part if the imaginary part is 0" do
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Rational(Complex(1, 0)).should == Rational(1)
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end
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it "raises a RangeError if the imaginary part is not 0" do
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lambda { Rational(Complex(1, 2)) }.should raise_error(RangeError)
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end
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end
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it "raises a TypeError if the first argument is nil" do
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lambda { Rational(nil) }.should raise_error(TypeError)
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end
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it "raises a TypeError if the second argument is nil" do
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lambda { Rational(1, nil) }.should raise_error(TypeError)
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end
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it "raises a TypeError if the first argument is a Symbol" do
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lambda { Rational(:sym) }.should raise_error(TypeError)
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end
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it "raises a TypeError if the second argument is a Symbol" do
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lambda { Rational(1, :sym) }.should raise_error(TypeError)
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end
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end
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end
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