spec/ruby/core/integer/odd_spec.rb


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require_relative '../../spec_helper'

describe "Integer#odd?" do
  context "fixnum" do
    it "returns true when self is an odd number" do
      (-2).odd?.should be_false
      (-1).odd?.should be_true

      0.odd?.should be_false
      1.odd?.should be_true
      2.odd?.should be_false

      bignum_value(0).odd?.should be_false
      bignum_value(1).odd?.should be_true

      (-bignum_value(0)).odd?.should be_false
      (-bignum_value(1)).odd?.should be_true
    end
  end

  context "bignum" do
    it "returns true if self is odd and positive" do
      (987279**19).odd?.should be_true
    end

    it "returns true if self is odd and negative" do
      (-9873389**97).odd?.should be_true
    end

    it "returns false if self is even and positive" do
      (10000000**10).odd?.should be_false
    end

    it "returns false if self is even and negative" do
      (-1000000**100).odd?.should be_false
    end
  end
end