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require File.expand_path('../../../spec_helper', __FILE__)
describe "Rational#rationalize" do
it "returns self with no argument" do
Rational(12,3).rationalize.should == Rational(12,3)
Rational(-45,7).rationalize.should == Rational(-45,7)
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
r = Rational(5404319552844595,18014398509481984)
r.rationalize(Rational(1,10)).should == Rational(1,3)
r.rationalize(Rational(-1,10)).should == Rational(1,3)
r = Rational(-5404319552844595,18014398509481984)
r.rationalize(Rational(1,10)).should == Rational(-1,3)
r.rationalize(Rational(-1,10)).should == Rational(-1,3)
end
it "simplifies self to the degree specified by a Float argument" do
r = Rational(5404319552844595,18014398509481984)
r.rationalize(0.05).should == Rational(1,3)
r.rationalize(0.001).should == Rational(3, 10)
r = Rational(-5404319552844595,18014398509481984)
r.rationalize(0.05).should == Rational(-1,3)
r.rationalize(0.001).should == Rational(-3,10)
end
it "raises ArgumentError when passed more than one argument" do
lambda { Rational(1,1).rationalize(0.1, 0.1) }.should raise_error(ArgumentError)
lambda { Rational(1,1).rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError)
end
end
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