ruby--ruby/spec/ruby/core/numeric/abs2_spec.rb

require_relative '../../spec_helper'

describe "Numeric#abs2" do
  before :each do
    @numbers = [
      0,
      0.0,
      1,
      20,
      bignum_value,
      278202.292871,
      72829,
      3.333333333333,
      0.1,
      infinity_value
    ].map { |n| [-n, n] }.flatten
  end

  it "returns the square of the absolute value of self" do
    @numbers.each do |number|
      number.abs2.should eql(number.abs ** 2)
    end
  end

  it "calls #* on self" do
    number = mock_numeric('numeric')
    number.should_receive(:*).and_return(:result)
    number.abs2.should == :result
  end

  it "returns NaN when self is NaN" do
    nan_value.abs2.nan?.should be_true
  end
end