spec/ruby/core/integer/even_spec.rb


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

describe "Integer#even?" do
  it "returns true for a Fixnum when it is an even number" do
    (-2).even?.should be_true
    (-1).even?.should be_false

    0.even?.should be_true
    1.even?.should be_false
    2.even?.should be_true
  end

  it "returns true for a Bignum when it is an even number" do
    bignum_value(0).even?.should be_true
    bignum_value(1).even?.should be_false

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