require 'test/unit'
require 'test/framework'

require 'units'

class TC_unit_equality < Test::Unit::TestCase
  
  understands UnitsTest

  def test_unit_equality

    Units.create :length do |m|
      m.system :english do |s|
        s.unit :name => :inch,
               :plural => :inches,
               :abbrev => :in
        s.unit :name => :foot,
               :plural => :feet,
               :abbrev => [ :ft ],
               :equals => 12.inches
        s.unit :name => :yard,
               :abbrevs => :yd,
               :equals => 3.feet
      end
    end
    
    inch = Units.length.english.inch
    foot = Units.length.english.foot
    yard = Units.length.english.yard

    assert(inch.equals.numeric == 1)
    assert(inch.equals.unit == {inch => 1})
    assert(foot.equals.numeric == 12)
    assert(foot.equals.unit == {inch => 1})
    assert(yard.equals.numeric == 36)
    assert(yard.equals.unit == {inch => 1})

    assert(inch.equals.to_s == "1 inch")
    assert(foot.equals.to_s == "12 inches")
    assert(yard.equals.to_s == "36 inches")

    a = 12.feet
    assert(a.numeric == 12)
    assert(a.unit == {foot => 1})
    assert(a.to_s == "12 feet")

    b = (2.0.ft^2)**0.5
    c = 1.4142135623.ft
    assert(b != c)
    assert(b =~ c)

  end
    
end