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

require 'units'

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

  def test_measure_create
    
    assert(Units.units_measures == [])
    
    assert(Units.create(:length).kind_of?(UnitsMeasure))
    assert(Units.length.kind_of?(UnitsMeasure))    
    assert_raise(UnitsException) { Units.time }
    assert(Units.units_measures.index('length') != nil)
    assert(Units.units_measures.index('time') == nil)
    assert(Units.units_measures.index('distance') == nil)
    
    assert(Units.create('time').kind_of?(UnitsMeasure))
    assert(Units.size == 2)
    assert(Units.time.kind_of?(UnitsMeasure))
    assert(Units.units_measures.index('length') != nil)
    assert(Units.units_measures.index('time') != nil)
    assert(Units.units_measures.index('distance') == nil)
    
    assert(Units.derive(:distance, 'length').kind_of?(UnitsMeasure))
    assert(Units.size == 3)
    assert(Units.distance.kind_of?(UnitsMeasure))
    assert(Units.length == Units.distance)
    assert(Units.units_measures.index('length') != nil)
    assert(Units.units_measures.index('time') != nil)
    assert(Units.units_measures.index('distance') != nil)

    assert(Units.delete(:time).kind_of?(UnitsMeasure))
    assert(Units.delete('time') == nil)
    assert(Units.delete('length').kind_of?(UnitsMeasure))
    assert(Units.delete(:length) == nil)
    assert(Units.size == 1)
    assert_raise(UnitsException) { Units.time }
    assert_raise(UnitsException) { Units.length }
    assert(Units.units_measures.index('length') == nil)
    assert(Units.units_measures.index('time') == nil)
    assert(Units.units_measures.index('distance') != nil)
    
    assert(Units.clear == Units)
    assert(Units.size == 0)
    assert_raise(UnitsException) { Units.time }
    assert_raise(UnitsException) { Units.length }
    assert_raise(UnitsException) { Units.distance }
    assert(Units.units_measures.index('length') == nil)
    assert(Units.units_measures.index('time') == nil)
    assert(Units.units_measures.index('distance') == nil)
    assert(Units.units_measures == [])
    
  end

end