spec/rubyspec/core/float/numerator_spec.rb


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require File.expand_path('../../../spec_helper', __FILE__)

describe "Float#numerator" do
  before :all do
    @numbers = [
      29871.2722891,
      999.1**99.928888,
      -72628191273.22,
      29282.2827,
      -2927.00091,
      12.0,
      Float::MAX,
    ]
  end

  it "converts self to a Rational object then returns its numerator" do
    @numbers.each do |number|
      number.infinite?.should be_nil
      number.numerator.should == Rational(number).numerator
    end
  end

  it "returns 0 for 0.0" do
    0.0.numerator.should == 0
  end

  it "returns NaN for NaN" do
    nan_value.numerator.nan?.should be_true
  end

  it "returns Infinity for Infinity" do
    infinity_value.numerator.infinite?.should == 1
  end

  it "returns -Infinity for -Infinity" do
    (-infinity_value).numerator.infinite?.should == -1
  end

end