#--
# $Id: tc_tuple.rb 7 2006-09-06 17:03:26Z prelude $
#
#
#     This file is part of the Prelude library that provides tools to
#     enable Haskell style functional programming in Ruby.
#
#     http://prelude.rubyforge.org 
#     
#     Copyright (C) 2006 APP Design, Inc.
#
#     This library is free software; you can redistribute it and/or
#     modify it under the terms of the GNU Lesser General Public
#     License as published by the Free Software Foundation; either
#     version 2.1 of the License, or (at your option) any later version.
#
#     This library is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#     Lesser General Public License for more details.
#
#     You should have received a copy of the GNU Lesser General Public
#     License along with this library; if not, write to the Free Software
#     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#++

class TestTuple < Test::Unit::TestCase

  def setup
    # Nothing
  end # setup

  def teardown
    # Nothing
  end # teardown

  def test_tuple
    result = Tuple.new()
    expect = [nil, nil]
    
    assert_equal(expect, result)

    result = Tuple.new(1)
    expect = [1, nil]
    
    assert_equal(expect, result)

    result = Tuple.new(1, 2)
    expect = [1, 2]
    
    assert_equal(expect, result)

    result = Tuple.new(1, 2, 3)
    expect = [1, [2, 3]]
    
    assert_equal(expect, result)

    result = Tuple.new([1, 2])
    expect = [1, [2]]
    
    assert_equal(expect, result)

    result = Tuple.new([1, 2, 3, 4, 5])
    expect = [1, [2, 3, 4, 5]]
    
    assert_equal(expect, result)
  end

  def test_fst
    result = Tuple.new(1, 2, 3).fst
    expect = 1
    
    assert_equal(expect, result)
  end

  def test_snd
    result = Tuple.new(1, 2, 3).snd
    expect = [2, 3]
    
    assert_equal(expect, result)
  end
end # TestTuple