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37 lines
1.4 KiB
Ruby
37 lines
1.4 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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describe "Rational#rationalize" do
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it "returns self with no argument" do
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Rational(12,3).rationalize.should == Rational(12,3)
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Rational(-45,7).rationalize.should == Rational(-45,7)
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end
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# FIXME: These specs need reviewing by somebody familiar with the
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# algorithm used by #rationalize
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it "simplifies self to the degree specified by a Rational argument" do
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r = Rational(5404319552844595,18014398509481984)
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r.rationalize(Rational(1,10)).should == Rational(1,3)
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r.rationalize(Rational(-1,10)).should == Rational(1,3)
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r = Rational(-5404319552844595,18014398509481984)
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r.rationalize(Rational(1,10)).should == Rational(-1,3)
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r.rationalize(Rational(-1,10)).should == Rational(-1,3)
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end
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it "simplifies self to the degree specified by a Float argument" do
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r = Rational(5404319552844595,18014398509481984)
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r.rationalize(0.05).should == Rational(1,3)
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r.rationalize(0.001).should == Rational(3, 10)
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r = Rational(-5404319552844595,18014398509481984)
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r.rationalize(0.05).should == Rational(-1,3)
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r.rationalize(0.001).should == Rational(-3,10)
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end
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it "raises ArgumentError when passed more than one argument" do
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lambda { Rational(1,1).rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
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lambda { Rational(1,1).rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
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end
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end
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