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require File.expand_path('../../../spec_helper', __FILE__)
ruby_version_is "1.9" do
describe "Float#rationalize" do
it "returns self as a simplified Rational with no argument" do
(3382729202.92822).rationalize.should == Rational(4806858197361, 1421)
end
# FIXME: These specs need reviewing by somebody familiar with the
# algorithm used by #rationalize
it "simplifies self to the degree specified by a Rational argument" do
f = 0.3
f.rationalize(Rational(1,10)).should == Rational(1,3)
f.rationalize(Rational(-1,10)).should == Rational(1,3)
f = -f
f.rationalize(Rational(1,10)).should == Rational(-1,3)
f.rationalize(Rational(-1,10)).should == Rational(-1,3)
end
it "simplifies self to the degree specified by a Float argument" do
f = 0.3
f.rationalize(0.05).should == Rational(1,3)
f.rationalize(0.001).should == Rational(3, 10)
f = -f
f.rationalize(0.05).should == Rational(-1,3)
f.rationalize(0.001).should == Rational(-3,10)
end
it "raises a FloatDomainError for Infinity" do
lambda {infinity_value.rationalize}.should raise_error(FloatDomainError)
end
it "raises a FloatDomainError for NaN" do
lambda { nan_value.rationalize }.should raise_error(FloatDomainError)
end
it "raises ArgumentError when passed more than one argument" do
lambda { 0.3.rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
lambda { 0.3.rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
end
end
end
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