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43 lines
1.4 KiB
Ruby
43 lines
1.4 KiB
Ruby
require_relative '../../spec_helper'
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describe "Float#rationalize" do
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it "returns self as a simplified Rational with no argument" do
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(3382729202.92822).rationalize.should == Rational(4806858197361, 1421)
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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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f = 0.3
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f.rationalize(Rational(1,10)).should == Rational(1,3)
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f.rationalize(Rational(-1,10)).should == Rational(1,3)
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f = -f
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f.rationalize(Rational(1,10)).should == Rational(-1,3)
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f.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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f = 0.3
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f.rationalize(0.05).should == Rational(1,3)
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f.rationalize(0.001).should == Rational(3, 10)
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f = -f
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f.rationalize(0.05).should == Rational(-1,3)
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f.rationalize(0.001).should == Rational(-3,10)
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end
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it "raises a FloatDomainError for Infinity" do
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-> {infinity_value.rationalize}.should raise_error(FloatDomainError)
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end
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it "raises a FloatDomainError for NaN" do
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-> { nan_value.rationalize }.should raise_error(FloatDomainError)
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end
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it "raises ArgumentError when passed more than one argument" do
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-> { 0.3.rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
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-> { 0.3.rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
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end
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end
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